There is a new version of Starling available on Haxelib (version 0.4.0).
haxelib update starling
The premultipliedAlpha issue has been resolved. (http://forum.starling-framework.org/topic/alpha-blend-and-texture-pma)
Additionally HTML5 now has support for the following features:
* Render Texture
Currently broken in HTML5:
Finally there is currently an issue with OpenFL's Context3DWrapMode and Context3DTriangleFace externs, which will resolve in errors while trying to target Flash and AIR. These have been resolved and merged into the OpenFL master branch, however these changes are yet to be pushed to Haxelib. However I would guess that OpenFL 3.5.3 is just around the corner.