Could it be that Apple are about to release a Pro version of the popular 20 and 24 inch iMac?
With the ever increasing power available on the iMac platform and its use as a workstation in collaborative environments, it would make sense to release a brushed metal high end version for those applications.
A better graphics card, the ability to go with 4.0 GIG of RAM and the Pro Metal treatment would be a winner in my view.
Not long to wait, WWDC is on tomorrow with Leopard all over the place as banners.
More rumors at Roughly Drafted.