I'm also really excited for this camera. I've recently started making a (full-time) living doing photography and my old 5dmii (which I love) could use a "big" brother.
I agree - OF COURSE - that 78% of photography is the user, but sometimes exciting technology can really help. Specifically, great AF and great low light performance. If this camera can replicate the new 1DX AF (or even come close, really), and take usable pictures in the ISO 6400 range I'll be thrilled. Great video and fast fps would be awesome too (but I can live with just incremental mark ii improvements here).
I will say however, that this price tag is surely not accurate. It's like buying a Honda Civic for $19,000. It's just not gonna happen (I know that the 5diii is more than just the "honda civic of cameras", but bare with me...). I would be willing to take wagers with people that this camera is closer to $3000 than $3500 when it hits. I'll say $3199, tops. UNLESS it has something really tricky up it's sleeve. It's not that $3500 is too much to pay for a camera of this caliber, it's just that the D800 is competing DIRECTLY against it (in marketing at least). I honestly think the big "trick" will be that the video is going to be incredible. Like it or not, Canon moves a lot of product based on it's indy film market. If this thing had Magic Lantern controls and better-than-5dmii performance out of the box it would destroy the competition. Nikon hasn't excited filmmakers since the D90 way back in the day, and that was a flop as soon as Canon released their slew of 1080p DSLRs.
Just my thoughts. I know many people that are waiting for this camera to start filming paid video work (indy films, weddings, commercials). Either way, I'm sure this camera is going to be awesome. I can't wait for those "official" Canon release pictures. Remember the 7D focusing brochure? That was great.