First read, this is the latest Canon announcement they have just made today:-
http://www.imaging-resource.com/NEWS/1283221661.html
They must have been insane! What? A 202 x 205mm sensor?! That is, 8" x 8"! Is this a 8R photo printout? :-o
Oh well, when the 645D is still having a 44 x 33mm "large" sensor, what camera Canon is going to make to adopt their this new super large sensor? But do note that the 645D is already large and heavy! @_@
Okay, personally I think the recent Canon announced new developments doesn't make any sense at all, frankly, including the last APS-H 120MP CMOS sensor's!