Call me paranoid, but this looks like a good tactic to spread the maximum amount of Fear, Uncertainty and Doubt into the already-collapsing Flash community while still keeping support for the platform.

Reminds me of the OpenGL vs DirectX wars. (not implying the situation is similar in any way, only the FUD tactic :) )

http://blog.wolfire.com/2010/01/Why-you-should-use-OpenGL-an...