I know some of these have already been said but here's my list:
Bring back the outside temperature to the main screen.
Display song information on the home menu
Have play/pause/next track/prev track controls accessible for CD/ Bluetooth/SD/MP3 from the main menu, not just the entertainment hub
When pausing a song, don't make the audio controls disappear in the entertainment menu.
Update the Sirius text labels. Include information for when they change select channels during the holiday season(ie Change BBC Radio One to Studio 54, Change Love to Holly during Christmas season, etc.)
Update support for more mobile broadband USB devices.