1. Installation:
Pretty much remains the same (as in Ubuntu 10.04), except a few notable additions, including informations about the Ubuntu One Music Store. (Sequential screenshots from a virtual machine given below)
2. Booting Process - The booting process is now insanely fast. It took me about 7-8 secs to start Ubuntu 10.10 alpha 2 on a virtual machine. Although practical booting time may increase, I doubt if it will be any more than 15 seconds.
3. Changes :
Ubuntu Software Center
It now has a History tab and better management of repositories, and now an all new "Whats New" section.
Pulse Audio
The volume options are now looking better than ever.
Other than that its pretty much Ubuntu 10.04. This is of course expected as its just an alpha 2 release. So, fingers crossed for a great release a few months from now.