With the release of Android 4.0 Ice Cream Sandwich developers are started working on it and one of the user of Android Central Breezy is working on delivering a taste of Ice Cream Sandwich to the Nexus S 4G. He has just posted screenshots of the ICS interface on the devices because there are lots of bugs and they need to be ironed out.
He also mention that it has some bugs like the non-functioning WiFi, Bluetooth, cellular data and the wonky touchscreen. And the one good news is that the buttons are working right now. And, beezy promises to update the project as he continues working.