I read this (http://mrooney.blogspot.com/2009/05/karmic-desktop-uds-run-down.html) and quite like almost everything I see.
Pidgin being replaced by Empathy is somewhat sad (I really like Pidgin), but the reasons are quite good.
Disclaimer: I am quite against any Mono (the technology beyond Banshee/F-Spot/Tomboy) applications being on the Ubuntu Desktop CD for other reasons. You can likely read why somewhere else :P. This isn't necessarily about Mono.
Banshee replacing Rhytmbox on the other hand, not so much.
However, it does seem to use 3-10x more memory than RB which is very troubling (60-300MB compared to RBs fairly consistent 25MB),Please, Please think of those of us who only have 512 Mb of ram in a laptop, or even those with less.
But clearly Banshee will get better memory usage over time..?
I reviewed it's memory usage (and others) about 2 years ago (Banshee was in dead last, then). http://gquigs.blogspot.com/2007/12/more-players-out-in-memory-performance.html
And yes, I realize Rhytmbox isn't going away, but development seems to slow in applications that lose "default" standing in Ubuntu.
Other items I am curious about: replacing gnome-pilot with multisync? any screensaver (removing) discussions? Remote desktop viewer vs terminal server client?