Update as of 10/11/2012
* Removed unused `Mage_DesignEditor_Model_History_Compact_Diff` class
* Fixes:
  * Incorrect title for Manage Products page
  * 'Element with ID 'wishlist_column_qty' already exists.' error on Manage Shopping Cart page
  * Incorrect redirect on "Print Shipping Labels" action, when shipment without shipping label selected
  * Error message is displayed twice, when restoring admin password with captcha enabled
  * Impossible to retrieve admin password, when captcha is enabled
Update as of 10/16/2012
* Introduced block arguments to the layout syntax:
  * Introduced the "object" block argument type to specify a grid data source
  * Introduced the "options" block argument type to accommodate key-value pairs
  * Introduced the "URL" block argument type to represent a URL with parameters
  * Introduced block argument updaters for the block arguments, which allow to customize the original grid arguments
  * Implemented extraction of translatable strings from block arguments in layout by the Translation Tool
* Declared the Customer Wishlist and Sales Order grids through the layout instead of the PHP classes
* Implemented the block `Mage_Backend_Block_Widget_Grid_Massaction` to encapsulate grid mass actions
* Moved grid columns and mass action management from the base grid `Mage_Backend_Block_Widget_Grid` to the `Mage_Backend_Block_Widget_Grid_Extended`
* Introduced the column set block `Mage_Backend_Block_Widget_Grid_ColumnSet` responsible for grouping columns in a grid
* Updated the grid rendering template to render a column set instead of rendering columns
* Eliminated dependency between the grid column block and parent blocks
* Denied the public access to the `pub/cron.php`
* Fixes:
  * Fixed the broken Billing Agreement View page
  * Fixed absence of the Default and Minimal attribute sets in the Manage Attribute Sets grid, if the total number of records is 22 and the view of 20 rows per page is chosen
  * Fixed typos on the Sales Order page
  * Fixed typos on the Sales Order's Packing Slips printed to PDF
  * Fixed preserving selected rows after searching in the Sales Order grid
  * Fixed "column not found" SQL error while sorting by the "Product Name" in the Catalog Pending Reviews grid
2.0.0.0-dev29
* Implemented and verified ability to upgrade DB from CE 1.7 (EE 1.12) to 2.x
* Replaced calendar UI component with jQuery calendar
* Restored back the public access to `pub/cron.php` entry point (in the previous patch it was denied by mistake)
* Fixed typo in label of "Catalog Search" index in UI
2.0.0.0-dev30
* Framework changes
  * Added dependency injection of framework capability
    * Adopted Zend\Di component of Zend Framework 2 library
    * Implemented object manager in Magento application
    * Refactored multiple base classes to dependency injection principle (dependencies are declared in constructor)
  * Themes/View
    * Implemented storing themes registry in database, basic CRUD of themes, automatic registration of themes in database from file system out of the box
    * Renamed `Mage_Core_Model_Layout_Update` into `Mage_Core_Model_Layout_Merge`, the former becomes an entity domain model. Similar changes with `Mage_Core_Model_Resource_Layout` -> `Mage_Core_Model_Resource_Layout_Update`, `Mage_Core_Model_Layout_Data` -> `Mage_Core_Model_Layout_Update`
* Performance tests
  * Improved indexers running script `dev/shell/indexer.php` to return appropriate exit code upon success/failure
  * Implemented running the same performance scenario file with different parameters
  * Slightly refactored framework class `Magento_Performance_Testsuite_Optimizer` for better visibility of algorithm
* Visual design editor
  * Added ability to remove elements in editor UI
  * Revised history of changes VDE toolbar and algorithm of "compacting" operations (moving, removing elements) as a layout update XML
  * Added selection of themes to VDE launcher page
* Refactored JavaScript of some UI elements to jQuery:
  * "Simple" and "configurable" product view pages
  * "Create Account" page
  * "Shopping Cart" page
  * CAPTCHA
  * Newsletter subscription
* Tax management UX improvements
  * Split Basic and Advanced Settings for Tax Rule Management UI
  * Moved the Import/Export functionality to Tax Rate page
  * Moved Tax menu to System from Sales
* Implemented the editable multiselect JavaScript component
* Added mentioning sitemap in `robots.txt` after generation
* Removed creation of DB backup in integration testing framework
* Fixed logic of order of loading ACL resources in backend
* Fixed JavaScript error during installation when one of files in `pub/media` is not writable
* Fixed structure of legacy test fixtures that allowed ambiguous keys in declaration
* Fixed inability to restore admin password when CAPTCHA is enabled
* Various minor UX fixes (labels, buttons, redirects, etc...)
* GitHub requests:
  * [#59](https://github.com/magento/magento2/issues/59) -- implemented handling of unexpected situations in admin/dashboard/tunnel action
  * [#66](https://github.com/magento/magento2/issues/66)
    * refactored ImageMagick adapter unit test to avoid system operation
    * simplified unit testing framework -- removed unused classes, simplified handling logic of directory `dev/tests/unit/tmp` and removed it from VCS
  * [#73](https://github.com/magento/magento2/pull/73), [#74](https://github.com/magento/magento2/pull/74) -- fixes in docblock tags
  * [#75](https://github.com/magento/magento2/pull/75), [#96](https://github.com/magento/magento2/pull/96) -- fixed translation module contexts in a few places
  * [#80](https://github.com/magento/magento2/issues/80) -- fixed some runtime errors in import/export module
  * [#81](https://github.com/magento/magento2/issues/81) -- removed usage of "remove" directive in places where it is overridden by setting root template anyway
  * [#87](https://github.com/magento/magento2/issues/87) -- changed paths of files to include from relative into absolute in `dev/shell/indexer.php` and `log.php`
  * [#88](https://github.com/magento/magento2/issues/88) -- provided comments for values that can be configured in `app/etc/local.xml` file
  * [#90](https://github.com/magento/magento2/issues/90) -- slightly optimized logic of implementation of loading configurable product attributes
2.0.0.0-dev31
* Themes:
  * Eliminated "skins" as a concept. Skins and themes are consolidated into one entity and now called just "themes"
  * New themes out of the box are named by their distinctive characteristic (thus, "default" is renamed to "demo")
  * Revised logic of handling "virtual" (which are present in database registry only, but not in the file system) VS "physical" themes
* Dependency injection:
  * Reduced memory leaks of integration tests caused by introduction of object manager
  * Added compiler for dependency injection definitions and ability to run Magento application with the compiled definitions
* `Mage_Adminhtml` breakdown:
  * Implemented XML-schema for system configuration form declaration files (`etc/system.xml` in each module), refactored them to comply with schema and relocated to `etc/adminhtml/system.xml`
  * Removed remnants of `Mage_Admin` module (replaced with `Mage_Backend` and others)
  * Removed multiple obsolete models in `Mage_Adminhtml` module -- replaced with more generic classes in `Mage_Backend` (less classes overall)
* Replaced `Magento_Test_TestCase_ObjectManagerAbstract` in unit testing framework by a helper in test suite
* Made the PHP coding standard test (`Php_LiveCodeTest`) treat white/black lists as `glob()` patterns and verify correctness of the actual patterns
* Consolidated `upload_max_filesize` logic into one helper
* Bug fixes:
  * Fatal error on Product Tags and Customers Tagged Product (on product editing page in backend)
  * Trailing space in date caused by new "date picker" JavaScript component
  * Impossibility to add product to an order in backend in IE8
  * Not picking a template on customer "Shopping Cart" page at the backend
  * "Use Default" checkbox is checked again after saving multiselect attribute config if option does not contain value
  * "Single Store Mode" UI fixes
  * Runtime error when previewing transactional email template
  * Incorrect redirect after applying filter in grids
  * Various asynchronous placement of profiler keys
  * Various fixes in Taxes backend UI
  * Various fixes in translation literals