Some new features:
-Images initializes with TextureSmoothing.DEFAULT, which can be set in your application / game's init() method;
-Static Signals injected in the Starling rendering phase(good for Counting, Pre/Post events);
-DisplayObject have childIndex, getChildNext(), getChildPrev() (not getters since they could be intensive calls, use local var to store it!)
-BlendMode lookup table;
-MovieClip callbacks on frames;
-Quad force-tint to batch draw-calls more efficiently in certain manual cases;

-General documentation clarifications;