The list below is *very* high level and is almost guaranteed missing some major features. Feel free to add them! That said, the general guideline for compiling this is "What new features would *users* be most interested to hear about?" Currently, this has been culled from a scan of the Krita Identi.ca dents, which in turn were user focused (142 character!) abbreviations of the Last Week in Krita posts (and a few blog posts). As such, if a feature hasn't been mentioned in a LWiK, there is an excellent chance it is missing here!
Caveats aside, here's what I have:
Obviously any extreme speedups, or squashing of bugs that have really vexed users are worth mentioning, too. :)