1)Do you have the cash to do it? IF not, you are finished. Others, read on
2)Do you care if the reviews are not out on the new cameras? If you do, you are finished. Others, read on.
3)Is your equipment about to self destroy so quickly that 1 and 2 don't matter? If it is, read on.
4)Do you follow the herd even when it has been spooked? If yes us let us know where it is going. (just curious!)
5)Will the eventual difference in performance in whatever spec you worry about make a substantive and noticeable difference to your performance as a photographer paid or otherwise? If yes, you need to read 2. You are finished.
Some good points but I don't agree with 5.
The reason gets back to the wildlife photographer needs vs the landscape, wedding, etc. folks. I was really hoping the 5Dmkiii would have a higher pixel density, like the Nikon D800, that would give me the ability to crop more closely, which I do a lot, and still have the wider view for those lucky times that the critters are closer and the APS-C sensor doesn't have the room, which has also happened on occasion. That's strictly about the sensor size and pixel density, so the reviews aren't that important.
If Canon had taken that route, I would have made the FF my main camera and kept the 7D as the backup. As it is, I've been thinking hard about switching to Nikon because I suspect it will be years before Canon comes up with something like the D800 but I'm afraid I'd lose too much money getting rid of my 500mm f4 tele and I sure can't afford to have a Nikon AND a Canon 500.