Speaking of Alpha 1:
A look at changes and new features in Alpha 1:
Firefox 9 Beta and Thunderbird 9 Beta
Linux Kernel 3.2
Multiple Screenshots and Embedded video support for detailed apps view in Ubuntu Software Center. Support for viewing prices and purchasing an application from list itself has also been added.
Banshee, Gbrainy and Tomboy have been removed. Rhythmbox is now default music player.
Source: Ubuntu Vibes