[Via Photography Bay] - Apparently the infamous Bryan Peterson himself has got on the rumor bandwagon. According to a post on his facebook page:
Two new Nikon’s-The D800, at 20MP, full frame, retail price of $2495.00 and Nikon DX-4, full frame at 19-20MP with a retail price of $5,000.00 and both will be announced by late September 2011!
Not really sure what to make of this. Given current exchange rates the prices seem too low ($2,999 and $5,499 would be more realistic we think), the timing seems off (August is expected), the DX-4 name is clearly wrong since DX points to the smaller sensors, and a D400/D4 combination is expected over the summer, with the D800 coming later...
Source: PB on 7/11/2011.