Samsung have finally released Ice Cream Sandwich (Android 4) for the Galaxy S2 (i9100). I had to install it manually using Odin as I’ve previously rooted my phone. I used this website to do it:

http://forum.xda-developers.com/showthread.php?t=1544487

so far so good. I’ve restored all my SMS messages and just installed the Chrome browser.

Not found anything that doesn’t work so far but will keep you posted.

It’ll take me a day or so to see what the battery life is like. but so far everything seems snappier and much more polished looking.