Jason O'Grady revives rumors of a tablet Mac in his 'The Apple Core' blog today with claims that the long-rumored Mac Tablet would finally be arriving later this year. Specifically, he believes that Apple will announce a 12" or 13" tablet "in the fall" of this year. The Mac Tablet will reportedly run full Mac OS X, have a slot loading Superdrive, an 'iPhone-type' GPS chip and an Intel Core Duo pro