Samsung has started rolling out Android 2.3.5 update for unlocked Galaxy S2 in some regions. The exact roll-out geographical spread is still unclear. This update improves the performance of the phone and brings some changes in TouchWiz UI because of patent issues with Apple.
This update is available via Samsung Kies and is not available OTA right now. So, plug in you Galaxy S II now i a PC and check for the update.

Samsung galaxy SII owners in India, are they getting this update?
No i checked
Indian Galaxy S II still stuck on 2.3.3 🙁
get the unofficial update from xda-developers and make your life a bit easy 😀
Samsung india have spent way too much time to remove Music hub from the ROM I guess,When the rest of the world is so fast up in the update mark,A slouch is what they seem..Indian SGS2 would get ICS probably at the dawn of jelly bean 😛
Samsung India guyz are behaving like LG.