For many users, if an official firmware update for their device isn't available, a leaked ROM will do just as well. Owners of Samsung's International Galaxy SII (I9100) willing to run leaked firmware will be happy to know that today, XDA user izap has provided Jelly Bean 4.1.2 (build JZO54K.I9100XXLSJ) firmware for all to enjoy.
Of course, there have been rumblings that the SII will receive an official update to 4.1 this month, but sooner is always better, right? Users are reporting that the leaked build is working just fine, though as with any unreleased firmware, your mileage may vary. Those thinking about installing the leaked firmware should know that their device will (unsurprisingly) be wiped in the process, and recovery will be overwritten.
It's also worth noting that you'll need to use Odin to install the leaked build. Conveniently, user izap has included Odin in the list of download links you can find at the original XDA thread. To grab the downloads and keep up with the discussion, you know what to do to the link below.
Thanks to Ali Salman and Luis Augusto Fretes Cuevas!