I wouldn't be at all surprised to see Apple use nVidia chips this time around. I believe the latest offerings are quite cool running and power conservative, which would work well with Apple's model.
Update: 9to5Mac has done some digging and come up with a few more interesting tidbits about the upcoming MacBook Pro refresh. For one, code pulled from the Mountain Lion beta appears to indicate that the Ivy Bridge machines will boast USB 3.0 and a new GPU in the NVIDIA GeForce GT 650M. The site also claims that the laptops will be slimmer than the current gen, a rumor that's we've been hearing for quite some time now.
If it's AMD, then it will be something from the upper 7xxxm series.
Apparently none of you run games under Windows.
NVIDIA driver support is beautiful. That alone makes the NVIDIA cards far more desirable than the AMD cards. I can't find any AMD driver support for my 6750M past 11.4, which is over a year old.
The NVIDIA GTX 660M is excellent at power conservation and is the fastest mobile 28nm (Kepler) GPU at this time.
I am a bit partial to nVidia but AMD is fine as well.
However, isn't the nVidia 650m and 660m just a Fermi card rebranded? I thought the mobile Kepler cards started at 670m?
Lastly, I thought the rumor was that the 670m was going to be in the new MBPs?
EDIT: Sorry, I thought the 650/660 were Fermi based cards.
-P
The "leaks" to 9to5mac about the new MBPs suggested they have Nvidia 650M GTs.
I thought they only mentioned the 640m...
(even so, I hope for the 650m,
or at least to have the option for it)
Nah it was a 650M GT, they're gonna need it if it's Retina.