Actually no 2012 iMac used at all since they're not out yet of course. I expect he'll extend these tests when they do hit the stores. I'd love to see the 2010/2 MacPro models (with their ancient GPUs) thrown in the mix.
If the Mac Mini 2012 had a NVIDIA 650M in it, I would have purchased one immediately. Without that (and since Thunderbolt doesn't really allow for using a graphics card externally given its 4x PCI lanes), then it's a no go for me.