Maybe I'm late to the game with this thought, but I've been looking at the Mac Pro design and wondering when the iMac designers will drop the spinning disk from the list of consumer specifications. PCIe SSDs are showing amazing performance numbers on the new MacBook Airs and an SSD only iMac would certainly help Jony and company to slim/thin the iMac even more. It's only a matter of time before they ship an SSD only iMac, but IMO the real question here is: Would they redesign the enclosure less than a year after releasing the "thin" model to make it even more thin?