Remember this rumor:
“Nikon is working on new battery grip for the next DSLR camera (possibly D800). It will have GPS module build inside, small LCD screen and some outputs.”
(http://nikonrumors.com/2009/12/22/rumor-nikon-dx-body-roadmap.aspx)
Today Canon announced this
http://www.engadget.com/2010/01/07/canon-announces-new-wireless-file-transmitter-units-for-latest-p/
the rumored Nikon battery grip now makes more sense – it may not be a battery grip at all