* UI still needs to be more thumb-friendly.
Bigger scroll bars or more consistent thumb-drag scrolling, option menus are still finger-unfriendly, etc

* I'd love a 'show thumb-keyboard by default' setting.
For me, using the stylus to peck at virtual keys is the exception.
A general 'finger navigation by default' setting would also be awesome, if it defaulted things like option menus to finger-friendly sizes as well as setting the virtual thumbboard as the default.

* navigation still feels a little sluggish.
App-switching and zoom/full screen should really be goosed up. Maybe when the CPU speed bump comes through that'll happen naturally. (assuming it hasn't already come through, as I haven't noticed it being any faster)

Other than that... the OS itself is fine. The changes are quite good.
I rather like the new theme and icons.