As much as I can't wait to see a retina iMac, the one thing I'm concerned about when it does arrive is the resolution. If you look at the display options of the retina MBP, you've got the native resolution of 1440 × 900 or you can run the scaled resolution of 1680 × 1050 which incurs a performance-hit in order to achieve. So if you're coming from a prior-generation of MBP with the high-resolution screen, native retina resolution gives you less screen-real-estate to work with. I'm wondering how this will translate to the iMac. The high-resolution iMac uses a resolution of 2560 x 1440. But would a retina iMac running at "native" retina resolution actually offer less screen-real-estate than that at a higher pixel density? Obviously all speculative at this point, but after playing with the retina MBP in the stores, it's the one thing keeping me from automatically embracing the concept of a retina iMac.