New HTML5 Canvas API support
Not for a while.
I asked both the Chrome team and the Firefox team about 1-2 months ago and neither of them had a concrete timeline. It doesn't yet seem to be a priority.
In an email correspondence of mine with FF people on October 28th they replied:
I assume you were referring to the Path / Pattern objects and related changes; there are—AFAIK—no immediate plans to implement them. Most of the work going into the 2D canvas implementation recently has been refactoring; in particular, we used to have two separate implementations, of which one has been removed a few weeks ago.