CyanogenMod is a very well known team of custom ROM developers. They have have paved the way and almost pioneered custom ROMs. The Cyanogen ROM is just about the most used base for all modded ROMs. Now they are showing off that famous cyan colored beauty on a GS3. Once they have this down then more developers can emerge for the development of the GS3.
As you can see from the image above this is running on the SCH-T999, more commonly known as the Samsung Galaxy S3. The ROM itself isn't officially released – yet; but the Cyanogen team is working very hard to get it all done and rolling to a device near you. This among numerous other additions and code changes apparently fixes the December issue as well. If you aren't familiar with that bug, it's where the month of December was missing. Mayan calendar conspiracy?
Steve Kondik says:
"Just a few more days of work left and I expect we'll have nightlies going for all the D2s. 4.2 is super smooth"
As you can imagine the ROM is good news to people anxiously waiting for CM10. We can assume that when it is all finalized and given Steve's stamp of approval it'll start being ported to other devices.