For anyone debating between the Canon 5D MK III and Nikon D800, here's an excellent video that compares both cameras in several different key areas.
The Verge has put up one of the first hands-on previews of Nikon's new D800:
Nikon today announced the D800, a brand new FX model designed to replace the highly regarded D700. Along with 36 megapixel resolution and seriously beefed-up video capabilities, it is indeed a lot of camera for roughly the same price as the D700 (when it was first released) - $2,999 USD.
Nikon also announced the D800E, an almost identical model to the D800, but without an anti-aliasing filter for improved image resolution and a $300 higher price tag
Visit the D800 microsite