Ok, I think I can give you actual changelog, but it's still can be changed:
- New Adreno200 libraries for ICS
- Fast and smooth system
- Live Wallpapers working - won't slowdown your system, like on Gingerbread! (I'm using Phase Beam, it's beautiful)
- Gallery and calculator fully working all the time
- Gmail working without any problem
- Browser working really good (smooth and fast)
- All apps with graphic problems, like Poweramp, now working without any
- Bluetooth headsets should work now (but you must to check that, I don't have any, but with Bluesoleil it's working)
- Updated AOSP/CM9 sources
- (development info) New gralloc and hwcomposer
- Updated Macław's audio libriaries
I think it's all for now, but it can be increased!