Apparently, one will be able to download the Android 4.1 Jelly Bean update via Samsung KIES, but it will not be made available Over-The-Air (OTA). Not only that, it will also “eat up” 1GB of the 12GB of available internal memory on your Galaxy S2, leaving you with just 11GB to play with after the Jelly Bean update is installed.
There will definitely be a fair number of new features that accompanies the Android 4.1 Jelly Bean update, including Smart Stay that helps keep the display on whenever it detects just when a human is looking at the display.
A leaked version of the official update is also floating somewhere around the Internet, but you would need to have a reasonable grasp of the Korean language if you want to give it a shot - either that or you have a really large appetite for risk.
February cannot come soon enough for Samsung Galaxy S2 owners, don't you think so?