[Galaxy Tab 10.1 Android Development] DivinityCycle:
Just to post in my $0.02, I just flashed this. Now, I was getting the build.prop errors when trying to flash until I updated my Clockwork Mod to version 5.5.0.4. I used Odin3 v1.85 to flash THIS Recovery file.

This worked and my CWM on my Galaxy Tab 10.1 WiFi-only is now up to date and compatible with the new zips.

Once I had the new CWM I did a factory reset, plus wiped the Dalvik cache, plus ran a permissions fix.

Then I flashed 18-07-12.08-39-jellybean-alpha-p4wifi-sig.zip, followed by gapps-jb-20120716.zip.

I did this while at work, and amazingly enough, the drivers for "Download Mode" came directly from Windows Update and installed automatically even though I don't have Admin rights on this machine! However, I didn't notice I was supposed to install the CPUscalingFix-sig.zip, so I flashed that afterwards. I doubt that matters but I'm trying to be as accurate as possible.

Also, I DID do that "Sign up for Google Now!" thing, and as noted int he OP, I resolved that issue by simply clearing the data for the Google Search app and then declining the Google Now offer. This will revert the Google Search app back to standard behavior, which is necessary for now.

As others have probably noted, I can confirm that on this build many things are working perfectly.

I am liking the new Google lockscreen button. This just links you to the Google Search app, but I didn't realize that the new Google Search app is pretty slick. Voice Search works and you get the new "Google things" type results, like if you search a movie title, Google Search automatically displays the poster, release date, and other relevant data right there in the app, no need to go to IMDB or elsewhere if you just want the most basic info. This also works on people, books, tv shows, and more, and it has IMDB style "click to go to" related links for actors and directors and whatnot. Very nice!

On my p4wifi, the camera is not working of course.

The mic and speaker work in applications like GrooveIP.

As others have noted, there's no HW accelerated video playback. You may not know, but JellyBean is changing the way HW acceleration works, and as a result its presently broken in this ROM.

Standard Def playback in the YouTube app works. I couldn't find any way to specifically say "ONLY DO SD, YOU JERK!".

HD playback does not work, and since lots of stuff on YouTube is HD, I had a lot of videos that wouldn't play.

I could not get ANY Netflix playback to work at all.

HuluPlus will not install directly from the Market (it says its incompatible).

The trailers in IMDB will play if you specifically choose 480P for your playback preferences. It mostly plays videos fine.

I personally don't do like any video playback on my tablet so its a non-issue for me.

My camera hasn't worked since I got this thing (I have been running ICS ROMs since day 1), so overall its a very nice experience.

No problems in Google Chrome so far, embedded YouTube videos link you to the YouTube app when clicked on, and as documented above, they work if they're not HD.

Google Earth works. I just found out they have a full 3D model of Portland, Oregon (where I live), and that runs kinda choppy but I never used Google Earth on the device under any previous ROMs so cannot comment on if this is "normal".

Google Maps and my GPS appear to be working totally fine. I got a prompt about it the first time I launched Google Maps but that's it, works fine and no prompts later.

I use a pair of Motorola BlueTooth headphones for music listening and stuff on the go. I was able to pair them up to my tablet with no special efforts and then listen to music streaming from my library via Google Play Music.

HOWEVER, with the BlueTooth turned on a paired to my headphones, I kept experiencing WiFi disconnects. The WiFi would automatically reconnect, but it was still a problem since I was streaming music via WiFi.

Tested the same activity with just headphones output, issue not present there. Weird that BlueTooth + WiFi = problem....

This ROM is freaking sweet!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!