I wont say how soon it will come, but I do know it will. The GSIII is in my opinion the top device out right now. I looked at the HTC One X and didn't like what I was seeing in certain areas, the GSIII won out hands down. But they're both on track getting JB just we have to wait and see when.
As for Nova, I had that on CM9 and didn't like it's lack of options so I went back to Apex. Unless they updated it since, not sure if CM9 used the Pro version of Nova or just normal, more than likely the free version though. So I can't really give an opinion on Nova Pro version.
KERNEL: Slim Stock
RECOVERY: TWRP 2.5
RIP: HTC Evo 4G