The 07 G Sedan has it, I've heard that the rev limit is 7.5k and pushing about 310hp. Torque is supposedly still in the 260 range though.

Somewhere down the line I think a 3.7L V6 is expected. I just found out I get VPP pricing with Nissan/Infiniti so I'm really waiting to see what they come with in the next couple of years. (Especially the GT-R)