The Story of the Samsung Galaxy S III is rather impressive: after months of anticipation there was a great unveiling in London, then the phone got rooted way before hitting the shelves, its shipping ROM got leaked and one of its top features, S Voice, was extracted and made available for other Android-powered smartphones. The community is now laying down another milestone with the release of the first custom ROM for the Samsung Galaxy flagship.
Future owners will have to wait at least nine days before getting their hands on the long-awaited device but they will be probably able to flash it with a custom ROM on day one. Based on previous community work comes a ROM that is based on Android 4.0.4, with build XXALE8 (of May 13, 2012), which is deodexed, rooted and zipaligned. Of course, because there are no Galaxy S III units out there (at least not final devices), the ROM is yet untested but make sure to bookmark the source link below if you are waiting for your own unit.
Source: XDA Developers