As a follow up to Keyan's points, can I ask a somewhat related question?
When you use a Nikon DSLR does it take you some time to figure out where things are? Just things in general. When shopping for a new camera, I was initially drooling over the D7000, and I thought, well it is just a bit more than the 60D. Well, as many times as I held it in my hands, fit issue aside, I could not figure out how things worked. With the 60D, everything made sense, and did not take me long to decide on it. Looking at the Nikon, by comparison, i could not even understand how to move the focus points around, let alone do more complex things. As for the menus, that was another area that looked fairly dated, and not very clear. I will be the first to admit that my complete lack of experience with Nikon DSLRs contributed to this feeling. Nevertheless, I really wanted to like the camera but just could not get over the initial apprehension of not understanding it. Just my two drachmas worth of opinion and (frustrated) experience.
Wait for actual head to head testing of the final production models. Everyone is freaking out about the specs of both cameras, but so far there have been no actual reviews of final production models, so you can't make a good judgement at all. Megapixels aren't everything, ironically that's the mantra Nikon kept for so long, and now this generation the tables are reversed.
If the market won't sustain the pricing Canon will drop it. IMHO all of their new stuff is VERY highly priced, from the lenses to the flash to the 5D3.