i'll agree with you on that... i can't see a new form factor tbh...
I think I seen it mentioned elsewhere, but for what it's worth the John Lewis UK website has no iMac's at all. They have every other Apple product imaginable, including the Mac Mini and Mac Pro, but no sign of the iMac.
People are expecting a new Mini, iMac, and Mac Pro in the desktop refresh, yet only the iMac has disappeared from the John Lewis site. So does this mean the iMac and only the iMac is going to receive an update this month?
If this update goes ahead tomorrow, it'll be interesting to see what model I receive. When I signed up to get the 2.4GHz 20" iMac for £612, I was told the deadline for orders was Feb 27th and that if a new model is launched the price would alter accordingly, including discount. If the order is put through today, of which there's a good chance, then Apple still show the 20" iMac as shipping within 24 hours.
While writing this post I took a look at PC World UK's website, and they are still showing stock, as are Currys Digital. John Lewis are hardly a renound Apple Reseller, more a case of them carrying the brand because of their own reputation.
Whatever happens, I'm not going to argue at getting a brand new 20" iMac for £612. And I'm extremely confident the ones people will be buying after the refresh will look identical to my own, with the exception of an LED screen and some speed bumps ... and a larger hole in their wallets.
If the machine does the job for you, that's all that matters in my opinion.