Today Jiangyi has posted the latest Android version, Lollipop 5.0 on XDA Developers Forum as [GT-I9100G][Lollipop]OmniROM 5.0 Unofficial Builds. Its still on Beta build and bugs is expected. Before you had the GT-I9100G device, and want to download it for your phone, be advise to read all the operating procedure so you wont get stuck at the boot. There's a few things that still broken in this build such as Camera and Cell Signal. Also the mobile data doesn't connect.
For those dev's and testers for this new version of Android, good luck on testing and reporting on error.
And thanks to Jiangyi for the awesome works bringing Lollipop to GT-I9100G.