Wow, this happened sooner than we expected - but Google just announced only minutes ago that the source code for Android 4.0.1 Ice Cream Sandwich is on its way to Google's AOSP tree right now. We'll update as we learn more. Here's the original post:
Hi! We just released a bit of code we thought this group might be interested in.
Over at our Android Open-Source Project git servers, the source code
for Android version 4.0 (Ice Cream Sandwich) is now available.