[Jasper_]

A big one that's being discussed right now is blend modes and filter effects on canvas, as we can't do a GPU blur or convolution filter on canvas contents right now. We're looking to see if it's possible to reuse some of the stuff like CSS filter effects on canvas 2D contents.

We've also helped with a lot of the baggage around audio decoding and synchronization, since Flash files can have MP3 files that require close sync to the timeline, so we need to use <audio> together with WebAudio, which is a giant bag of worms. We're still working through that on the web audio mailing list.

And we've also helped with some minor additions to the spec that aren't really too hard to implement, like canvas's isPointInStroke().