No, we're going to talk about THIS! http://www.macrumors.com/2012/06/13/...er-than-later/
The current iMac case is great, so who cares if it's not revamped and given a big public unveiling? All the iMac needs is the newest chipset/graphics card, more RAM/storage per $, USB 3.0 and a FaceTime HD cam. Anyone seriously demanding a Retina display on an iMac should calm the eff down -- they'll do it eventually, when it's cheaper to do, but given the distance you sit from a desktop screen it's hardly necessary.