Beside a lot of small improvements this new release improves the graphics capabilities, with a focus on Flash features used by games.
Here is the changelog:
* Fixed a few memory leaks
* Improved support for BitmapData::draw
* Support for BitmapData::copyPixels
* Support for soft masking
* Support for memory usage profiling (massif compatible)
Moreover, there has been some work on implementing fully accelerated Stage3D support, it’s still in early design phase... but stay tuned.