I was just reading all of the upcoming announcements from Nikon, Sony, etc., and I have a new question to ponder:
Why should Canon upgrade any of its cameras at this moment, since they are in the driver's seat, solidly: They have the only FF 21MP 35mm camera, arguably the best prosumer/pro FF 35mm (5D) and no one is slated to challenge them in the next eight months with anything at this level?
If you want better quality and more pixels than the 5D has, you buy the 1DS MKIII for 8K US or you shut your pie hole, cry more, and go home. I'll bet we get no new cameras from Canon until 2009.
I would suggest for those who can wait, to wait. There is just too much going on right now to buy an 8, 000 dollar camera that may be obsolete in one year.