Apple has updated it’s iMac and it is thinner and more powerful, and now sans a CD rom drive.
Most impressive for editing are NVIDIA Mobile processors across the line, so they should all be great for CUDA in Premiere Pro. The low end has a GT 640M with 512MB of RAM, the second has a GT 650M with 512MB, the 3rd has a GTX 660m with 512MB and the high end has a GTX 675 with 1GB of RAM (best for editing right there). Even better the high end is configurable to a Geforce GTX 680MX with 2GB of RAM!
Too bad ll the stock models have i5 processors, but you can upgrade to an i7 that is 3.4Ghz. The high end also has user addable RAM, though the smaller model is soldered, but comes with 8GB to start.
Another exciting upgrade is the Fusion Drive you can get in BTO. It has 128GB of Flash Ram tied to 1 or 3 TB of regular hard drive, so your system can be on the fast Fusion, but you seamlessly get FLASH speeds for your system.
Starting at $1299-$1999 and available in November to December.
You have to configure it, but it really could be a great editing machine, especially with Thunderbolt, though I would prefer a non-mobile video card personally.