The long wait is over the D800 is officially announced!

The D800 can shoot 1080p movies at 30, 25 or 24 frames per second and at up to 24Mbps, or uncompressed via HDMi Out.
Weight approx. 1,000 g/2 lb 3.3 oz with battery and SD memory card but without body cap; approx. 900 g/1 lb 15.7 oz (camera body only)
When video is output through HDMI interface simultaneously with recording to a CF/SD card, output image through HDMI interface will be smaller than 1,280 x 720. (From nikon site)

These sites have more information available:

http://www.imaging-resource.com/PRODS/nikon-d800/nikon-d800A.HTM 

http://nikonrumors.com/

http://www.dpreview.com/previews/nikond800/

http://www.theverge.com/2012/2/6/2775162/nikon-d800-hands-on-preview

http://www.ferra.ru/ru/digiphoto/review/Nikon-D800-preview/print/ 

PDF

http://imaging.nikon.com/lineup/dslr/d800/pdf/d800_28p.pdf

Sample Images

http://imaging.nikon.com/lineup/dslr/d800/sample01.htm

http://imaging.nikon.com/lineup/dslr/d800/sample02.htm

DSLR Newsshooter
http://www.dslrnewsshooter.com/2012/02/06/nikon-launch-the-d800-a-dslr-with-audio-monitoring-for-2999-us/ 

Video shot with nikon D800

A film by Sandro shot with the Nikon D800.

Director: Sandro

Editor: Alaster Jordan / Whitehouse

Music: Yessian

Production: Cap Gun

View the Behind the Scenes Video shot by the Nikon Crew: http://vimeo.com/36306101