Update #2: Nikon 800 could also be related to this product.
Update: the ad says "Nikon 800" and not "Nikon D800". Not sure what are they advertising here (the Nikon SB-800 flash has been discontinued).
You ca see that the link points directly to europe-nikon.com and not to a third party reseller looking for extra Internet traffic (like we had in the past), which means that Nikon Europe is paying for this ad.
Some of the latest rumors are that the Nikon D700 replacement will be called D800 and not D700s or D700x. The D800 is expected to have a new sensor (probably 18MP) and 1080 video recording capabilities and should be released latest by the Summer of 2010.
It has begun 🙂