[Galaxy S III General] Steve_max:
Looks like there's at the very least some sort of limited revision history, and commit descriptions (although a few are pretty indescritive, like "Merge"). An example, from the first random link I clicked (insignal/origen_quad/android/platform/system/bluetooth):

Age	Commit message (Expand)	Author
2012-08-20	Origen Quad MT6620 bluetooth work.mds_20120904insignal-ics	Taeyoung Kim
2011-11-01	merge in ics-mr1-release history after reset to ics-mr1android-4.0.4_r2.1android-4.0.4_r2android-4.0.4_r1.2android-4.0.4_r1.1android-4.0.4_r1android-4.0.3_r1.1android-4.0.3_r1	The Android Automerger
2011-10-27	Check EALREADY status for HCIDEVUP commandandroid-sdk-4.0.3_r1android-sdk-4.0.3-tools_r1android-cts-verifier-4.0_r1android-cts-verifier-4.0.3_r1android-cts-4.0.3_r2android-cts-4.0.3_r1	Matthew Xie
2011-10-23	merge in ics-release history after reset to master	The Android Automerger
2011-10-20	Bluetooth: Add BMW MINI10013 in blacklist	Chunho Park
2011-09-11	merge in ics-release history after reset to master	The Android Automerger
2011-09-09	Merge "Sync main.confs with that of Bluez"android-sdk-adt_r16.0.1android-cts-4.0_r1android-4.0.2_r1android-4.0.1_r1.2android-4.0.1_r1.1android-4.0.1_r1	Matthew Xie
2011-09-09	Sync main.confs with that of Bluez	Matthew Xie
2011-09-08	Change RememberPowered to false	Matthew Xie
2011-08-15	merge in ics-release history after reset to master	The Android Automerger
2011-08-10	Change class to handheld from Laptop.	Jaikumar Ganesh
2011-08-01	merge in ics-release history after reset to master	The Android Automerger
2011-07-29	Bluetooth: fix for the unrecoverable state after BT on is failed	jhtop.kim
2011-07-28	merge in ics-release history after reset to master	The Android Automerger
2011-07-27	keep history	The Android Automerger
2011-07-21	Add Car to the partial name blacklist.	Jaikumar Ganesh
2011-07-08	merge in ics-release history after reset to master	The Android Automerger
2011-07-08	Fix setting of baud rate when coming out of reset.	Jaikumar Ganesh
2011-07-06	Fix setting of baud rate when coming out of reset.	Jaikumar Ganesh
2011-06-29	Log return error code for failure case.	Jaikumar Ganesh
2011-06-29	Bluetooth BRCM script updates for new chipsets.	Howard M. Harte
2011-06-18	Merge	Jean-Baptiste Queru
2011-06-18	Merge	Jean-Baptiste Queru
2011-06-18	Merge	Jean-Baptiste Queru
2011-06-18	Merge	Jean-Baptiste Queru
2011-06-18	Merge "marker to enable legacy behaviors"android-sdk-tools_r12android-sdk-adt_r12	Jean-Baptiste Queru
2011-06-18	marker to enable legacy behaviors	Jean-Baptiste Queru
2011-06-18	Merge "Restore code that was removed too aggressively"	Jean-Baptiste Queru
2011-06-18	Restore code that was removed too aggressively	Jean-Baptiste Queru
2011-06-18	Merge "tweak for forward-compatibility"	Jean-Baptiste Queru
2011-06-18	tweak for forward-compatibility	Jean-Baptiste Queru
2011-05-26	Add LE variants for the main.conf files.	Jaikumar Ganesh
2011-05-18	Merge from honeycomb-plus-aosp	Jean-Baptiste Queru
2011-05-17	Merge "Update License to Apache."	Jaikumar Ganesh
2011-05-17	Update License to Apache.	Howard M. Harte
2011-03-30	Implement HCI_UP test bit function inline.	Jaikumar Ganesh
2011-03-29	Update conf files for Bluez upgrade to 4.89	Jaikumar Ganesh
2011-03-29	Update header files for Bluez upgrade to 4.89	Jaikumar Ganesh
2011-02-08	Add Peugeot 307 to the auto pairing blacklist.android-sdk-3.1_r1android-3.2_r1android-3.2.4_r1android-3.2.2_r2android-3.2.2_r1android-3.2.1_r2android-3.2.1_r1android-3.1_r1	Jaikumar Ganesh
2011-02-03	Set rfkill power off if turning BT on fails.android-sdk-3.0_r1android-3.0_r1.3android-3.0_r1.2android-3.0_r1.1android-3.0_r1	Jaikumar Ganesh
2011-01-12	Add Mot keyboard to blacklist file.android-sdk-3.0-pre	Jaikumar Ganesh
2010-12-20	Fix corruption while reading the address.	Jaikumar Ganesh
2010-12-08	Add option to set the baudrate before downloading the firmware.	Jaikumar Ganesh
2010-11-24	Minor class bits cannot be ORed.	Jaikumar Ganesh
2010-11-24	Change Service class for nonsmartphone case.	Jaikumar Ganesh
2010-11-11	Add BT_POWER socket option and bt_power structure.	Jaikumar Ganesh
2010-11-04	Add command-line option for PCM master/slave to brcm_patchram_plus	Chris Fries
2010-11-01	am 9bd98263: am b520f840: Merge "System/bluetooth/bludroid:Remove the 3 secon...	Jean-Baptiste Queru
2010-11-01	am b520f840: Merge "System/bluetooth/bludroid:Remove the 3 second delay after...	Jean-Baptiste Queru
2010-11-01	Merge "System/bluetooth/bludroid:Remove the 3 second delay after starting blu...	Jean-Baptiste Queru
2010-10-26	System/bluetooth/bludroid:Remove the 3 second delay after starting bluetoothd	Bheemsen Kulkarni
2010-10-19	am 7dc55059: Add Parrot car kit (KML_CAN) to the auto pairing blacklist.	Jaikumar Ganesh
2010-10-19	Add Parrot car kit (KML_CAN) to the auto pairing blacklist.android-sdk-2.3.4_r1android-cts-2.3_r5android-cts-2.3_r4android-cts-2.3_r3android-cts-2.3_r2android-cts-2.3_r12android-cts-2.3_r11android-cts-2.3_r10android-cts-2.3_r1android-2.3_r1android-2.3.7_r1android-2.3.6_r1android-2.3.6_r0.9android-2.3.5_r1android-2.3.4_r1android-2.3.4_r0.9android-2.3.3_r1aandroid-2.3.3_r1.1android-2.3.3_r1android-2.3.2_r1android-2.3.1_r1	Jaikumar Ganesh
2010-10-14	Set BT class for nonsmartphone case.	Jaikumar Ganesh
2010-10-04	System/bluetooth/bludroid:Remove the 3 second delay after starting bluetoothd	Bheemsen Kulkarni
2010-09-28	am 501cc9c1: Revert "Delay 200 ms after powering up the BT chip.."	Jaikumar Ganesh
2010-09-28	Revert "Delay 200 ms after powering up the BT chip.."	Jaikumar Ganesh
2010-09-27	Separate smarthphone and nonsmartphone variants.	Jean-Baptiste Queru
2010-09-10	am 3cd1a144: Set line discipline to HCI_UART_H4 even for low power mode.	Jaikumar Ganesh
2010-09-10	am 82b2b955: Delay 200 ms after powering up the BT chip..	Jaikumar Ganesh
2010-09-10	Set line discipline to HCI_UART_H4 even for low power mode.	Jaikumar Ganesh
2010-09-10	Delay 200 ms after powering up the BT chip..	Jaikumar Ganesh
2010-08-18	Merge "added conf file for network"	Danica Chang
2010-08-12	added conf file for network	Danica Chang
2010-08-11	Add parrot to the blacklist for auto pairing.	Jaikumar Ganesh
2010-04-05	Update brfpatch for new TI firmware scripts.android-sdk-tools_r7android-sdk-tools_r6android-sdk-2.2_r2android-sdk-2.2_r1android-cts-2.2_r8android-cts-2.2_r7android-cts-2.2_r6android-cts-2.2_r5android-cts-2.2_r4android-cts-2.2_r3android-cts-2.2_r2android-cts-2.2_r1android-adt-0.9.9android-adt-0.9.8android-2.2_r1.3android-2.2_r1.2android-2.2_r1.1android-2.2_r1android-2.2.3_r2.1android-2.2.3_r2android-2.2.3_r1android-2.2.2_r1android-2.2.1_r2android-2.2.1_r1	Nick Pelly
2010-03-30	Add another car kit vendor to the blacklist file.	Jaikumar Ganesh
2010-03-24	Add hci_command_hdr to clean bluez headers.	Nick Pelly
2010-03-22	Disable park state in main.conf	Bao Liang
2010-03-19	Add blacklist for Bluetooth SCO connections	Eric Olsen
2010-03-16	Delay 50ms before downlooading firmware patch to fix BCM4329B1 incompatability.	Nick Pelly
2010-03-09	Add an empty CleanSpec.mk	Jean-Baptiste Queru
2010-02-26	Merge "Add Auto Pairing blacklist, change paths."	Jaikumar Ganesh
2010-02-24	Update bluez clean headers for struct sockaddr_sco change.	Nick Pelly
2010-02-09	Do not attempt role switch to Master.	Nick Pelly
2010-02-05	am d7a53f14: am 39760b25: reconcile main tree with open-source eclair	The Android Open Source Project
2010-02-05	am 39760b25: reconcile main tree with open-source eclair	The Android Open Source Project
2010-02-05	reconcile main tree with open-source eclairandroid-sdk-tools_r5android-cts-2.1_r5android-cts-2.1_r4android-cts-2.1_r3android-cts-2.1_r2	The Android Open Source Project
2010-01-29	reconcile android-2.1_r1 snapshot	The Android Open Source Project
2010-01-12	android-2.1_r1 snapshot	The Android Open Source Project
2010-01-08	Add Auto Pairing blacklist, change paths.	Jaikumar Ganesh
2009-12-15	Merge commit 'goog/eclair-plus-aosp'	Android Git Automerger
2009-12-11	am 4522d8ef: Add L2CAP_LM_FLUSHABLE to clean Bluez headers.	Nick Pelly
2009-12-11	am dc18c419: Update Bluez header for new ACL state debug parameters.	Nick Pelly
2009-12-09	am 4522d8ef: Add L2CAP_LM_FLUSHABLE to clean Bluez headers.	Nick Pelly
2009-12-09	am dc18c419: Update Bluez header for new ACL state debug parameters.	Nick Pelly
2009-12-09	Add L2CAP_LM_FLUSHABLE to clean Bluez headers.android-sdk-2.1_r1android-2.1_r2.1sandroid-2.1_r2.1p2android-2.1_r2.1pandroid-2.1_r2android-2.1_r1	Nick Pelly
2009-12-09	Update Bluez header for new ACL state debug parameters.	Nick Pelly
2009-11-15	merge from open-source master	Jean-Baptiste Queru
2009-11-15	merge from open-source master	Jean-Baptiste Queru
2009-11-15	merge from eclair	Jean-Baptiste Queru
2009-11-13	eclair snapshot	Jean-Baptiste Queru
2009-10-31	Add support for ba2str and str2ba to bluedroid.android-sdk-2.0.1_r1android-sdk-2.0.1-docs_r1android-2.0.1_r1	Nick Pelly
2009-10-30	Fix low power mode bugs in brcm_patchram_plus.	Nick Pelly
2009-10-30	Add hci struct to clean headers.	Nick Pelly
2009-10-21	Read Bluetooth address from system property ro.bt.bdaddr_path	Nick Pelly
2009-09-15	Checkpoint of debug tools changes.android-sdk-tools_r4android-sdk-tools_r3android-sdk-2.0_r1android-2.0_r1	Nick Pelly
2009-09-01	Merge change 23505 into eclair	Android (Google) Code Review
2009-09-01	Checkin some testing tools. Not compiled by default.	Nick Pelly
2009-08-21	Switch from DOS to UNIX format on brcm_patchram_plus.c
2009-08-21	Fix baudrate programming for BCM chipsets.	Nick Pelly
2009-08-20	Add brcm_patchram_plus from Broadcom.	Nick Pelly
2009-08-18	Do not advertise A2DP sink support.	Nick Pelly
2009-08-18	Strip extra quotes from device name.	Nick Pelly
2009-08-03	Set class field appropriately.	Jaikumar Ganesh
2009-06-23	Checkpoint some debug tools. Not built by default.	Nick Pelly
2009-06-10	Add ro.product.model for name of the device.	Jaikumar Ganesh
2009-06-05	Bluez4 changes.	Jaikumar Ganesh
2009-05-18	Adding functionality to tests.	Nick Pelly
2009-05-15	Fix pipetest build.	Nick Pelly
2009-05-15	Merge change 1786	Android (Google) Code Review
2009-05-15	Merge change 1785	Android (Google) Code Review
2009-05-15	Merge change 1784	Android (Google) Code Review
2009-05-15	Move socktest.	Nick Pelly
2009-05-15	Move bttest to new location in system/bluetooth/tools	Nick Pelly
2009-05-15	Add pipetest test utility.	Nick Pelly
2009-05-13	Merge change 1398	Android (Google) Code Review
2009-05-13	Merge change 1395	Android (Google) Code Review
2009-05-11	Add utility for testing native code sockets.	Nick Pelly
2009-05-11	Add l2cap.h to bluez clean headers.	Nick Pelly
2009-04-23	Merge donut into master	Jean-Baptiste Queru
2009-03-29	Merge branch 'open_source_no_contributions' into google_internal	The Android Open Source Project
2009-03-27	Merge commit 'korg/cupcake'	The Android Open Source Project
2009-03-19	auto import from //branches/cupcake_rel/...@140373android-sdk-tools_r2android-sdk-1.6_r2android-sdk-1.6_r1android-sdk-1.6-docs_r1android-sdk-1.5_r3android-sdk-1.5_r1android-sdk-1.5-preandroid-1.6_r2android-1.6_r1.5android-1.6_r1.4android-1.6_r1.3android-1.6_r1.2android-1.6_r1.1android-1.6_r1android-1.5r4android-1.5r3android-1.5r2android-1.5	The Android Open Source Project
2009-03-17	Merge commit 'remotes/korg/cupcake' into merge	Jean-Baptiste Queru
2009-03-09	auto import from //branches/cupcake/...@137197	The Android Open Source Project
2009-03-04	auto import from //depot/cupcake/@135843	The Android Open Source Project
2009-03-04	auto import from //depot/cupcake/@135843	The Android Open Source Project
2009-03-03	auto import from //depot/cupcake/@132589	The Android Open Source Project
2009-03-03	auto import from //depot/cupcake/@137055	The Android Open Source Project
2008-12-19	Merge commit 'remotes/korg/cupcake'	Jean-Baptiste Queru
2008-12-18	Code drop from //branches/cupcake/...@124589	The Android Open Source Project
2008-11-25	Add include path to build libbluedroid.	Nick Pelly
2008-11-13	Use the rfkill kernel API to power up/down bluetooth.	Nick Pelly
2008-10-21	Initial Contributionandroid-1.0

At least this looks better than what I expected.