I speak from the point of view of an average PC user, and I'd only hope to see a couple things (though I expect they will never happen):
_Stability_, especially for the things an average user uses, for example, gphoto2 *and* it's implementation. In Intrepid, gphoto2 was pretty much useless, requiring root to access my Kodak, which then gave file ownership to root when transfering images. Implementation is far better in Jaunty, but gphoto2 itself crashes Nautilus (as desktop) when making thumbnails. These stability issues are not limited to gphoto2, but to me is the most annoying. We must stop releasing broken software.
_Usability_. who decided BlueZ 4 was to replace 3? Not all new things are better. My bluetooth worked great in Hardy, (or Gutsy, I can't remember) then on one dist-upgrade we switched to BlueZ 4 and half of my devices no longer connect to it. There seems to be less connectivity and less functionality with the new bluetooth stack, what exactly did we gain from this switch? Again, this is not limited to bluetooth, general regressions seem to happen everywhere, and often more is lost than gained.
It seems to me that the devs put too much on their plates; with such relatively short amounts of time between releases, it's foolish to to add more; slow it down, keep it simple, and DO IT RIGHT. (I still can't believe that Intrepid was actually released with the ALSA-Network conflict at shutdown issue, which was well known during beta, and lets not forget the boondoggle of a half-assed initial implementation of PA, both caused simply by haste) I'd rather have less new features that work right, than more that fall on their face.
Would you put a fancy new stereo in your car, if your brakes only worked half of the time?