Steve Jobs will be announcing that the iMac is dead and in its place they are releasing a revolutionary new computer that is light years ahead of anyone else!
While everyone else in PC land have been spending millions on R&D to develop "all in one" computers that comprise the Motherboard, CPU, Memory, Storage and LCD screen in one unit (of course to try and keep up with Apple) Apple will announce that their new desktop range will in fact comprise of a desktop unit the same size as a Mac Mini paired with a new 2cm thin LED LCD screen that will be bundled with the computer in a choice of 20,24 or 30".
While that news may come as a shock to most mac consumers that is not the revolutionary part, the revolutionary thing is that the new keyboards have a delete key that actually deletes!!! (okay that is not true but just occurred to me now while trying to delete something on my MBP)
So anyway, that is my guess and who knows, stranger things have happened!!!