A dude on e-bay is selling a set of G35 rims. He claims the size is

5 X 114

And has a 45mm offset.

I would think the Z would be the same or slightly different offset possibly. Those sizes are good because they are fairly common. We should have a large selection of wheels for the Z.

 

It's almost certain that the lug pattern is 5x114. My guess on the offset when I saw it at the Cleveland Auto Show was 40-45mm, so this is good news if the g35 is that. Only a matter of time will tell for sure though.