here is what I feel has improved:
1) superb booting time.
2) very very slick
3) "Places" feature on top bar is awesome
4) ext4 makes file copy and boot times lot faster
What hasn't:
Unfortunately, I can't make this my primary OS still as TV still doesn't work on this one. All I see is scrambled signal where all I can find out is the channel logo everythign else is black.
I still am unable to find worthy alternate to WMP and JetAudio. Haven't tried to copy songs to Cowon D2 yet but will see if the media players in ubuntu will recognize D2 or not.
Very nice overall!!!