Wanted to draw some conclusions based off of this article. I think that we will see new iMacs and Minis in July with a Mountain Lion release.
http://www.primatelabs.com/blog/2012/05/ivy-bridge-macs/
We see that the CPUs tested for the Macbook Pro from this article was the i7 3820qm. This CPU was a BTO/CTO option that could be only added to the Macbook Pro Retina. The highest available choice.
I would imagine that the suspected 2012 iMac tested here, with the i7 3770, is the BTO/CTO option available for the 27" - much like the current i7 2600.
It would make sense for these two benchmarks to appear/leak, as they're benchmarks of the high end CPU offering each 2012 model has.
The Retina Macbook Pro came out a month after this article so WWDC had something to woo the crowd with (which it did, such an awesome display).
I think it makes sense that the iMac and Mini come out alongside Mountain Lion.
Many believe that Nvidia mobile GPUs are the reason the iMac is delayed. Many believe that the iMac is delayed because it will be released when Mountain Lion is released. Some believe there is no 2012 iMac to be released.
For me, I believe that the iMac will be coming out with Mountain Lion in July (and the Mac Mini too). I wager it will have an AMD 7xxxm series. I think this will happen because I am almost certain that whatever iMac that benchmark represents is nearly 99% ready for production. With a GTX 680m not available in May (I could be wrong here too, production samples/etc.), I feel that that machine had an AMD GPU (probably a 7970m - I think it was available end of April).
Thoughts on this anyone?