Some of the first screenshots of Android Ice Cream have been leaked to AndroidPolice.com and RootzWiki.com. The images that editors from both of those websites uploaded are in the gallery below.
The screenshots indicate that Android has made some major UI changes. There is a lot of blue color everywhere. The notification bar has also been changed around. There is a brand new launcher and app drawer and there appears task switcher icon on the homescreen.
The camera has a panorama mode and Gmail has been revamped. Ice Cream will be available for the Nexus S, but the Nexus Prime gets it first and other devices will follow.