My thoughts....I'm starting to think a minor cosmetic change will be made when the iMacs get upgrades. I'm thinking they will adopt the color scheme of the new ACD. The iMacs will become all black in the front with the silver edging, and the back will look exactly like the new ACD, which also looks like the back of the recently redesigned MacBooks/MacBook Pros. I know it wont look exactly like the ACD though because it needs somewhere to have the hardware. So imagine an extra 4" on the bottom of the ACD in the pictures below.