Aaron does a walkthrough of Ice Cream Sandwich on Sprint's Nexus S 4G.  Rolling out now, it brings the improvements of Android 4.0 to the older Nexus device.  New features include revamped voice dictation, a revised color scheme, and some nice performance improvements.  The Nexus S 4G joins the Nexus, HTC Vivid, and HTC Sensation 4G in the Ice Cream Sandwich upgrade club.