Nikon has a big press conference scheduled for Nov. 20, and I'm pretty darned sure, both from the amount of chatter and from the fact that all their competitors have high-resolution bodies, we'll see something with more than 12 MP from them on that date. Apart from the ridiculous (like a high-resolution Coolpix), there are three options (four if you count the unlikely high-resolution non-full-frame D300 variant). We could see a D700x that competes with the Alpha 900 and the 5DmkII, a D3x that goes head to head with the 1Ds mk III, or something completely different. Rumors have included everything from the trivially easy (a D700 body with the Sony Alpha 900 sensor in it) up to the never before tried (a medium-format body with electronic viewfinders only (the primary finder would probably be a supersize rear LCD - something approaching 5 inches and 1024x768 resolution)). So, what do folks think it'll be, and what do you want to see?
Personally, I'd love to see Nikon go medium format - the all-electronic (or electronic plus optical rangefinder, but non-SLR) design actually has a lot of appeal, because it could be the size of a Mamiya 7, which is a wonderful field landscape camera that never made the transition to digital. It could shoot like a Mamiya 7 when needed, marvelously easy to handhold, yet turn into a camera with 4x5 versatility when plunked down on a tripod with a tilt/shift lens (or a tilt/shift adapter like Hasselblad makes) on it. The LCD would actually be big enough to judge the effect of camera movements (plus it would be easy to magnify whatever area you're concerned about). If it used a sensor of the smallest "medium format" size - 33x44 mm -and the pixel pitch of the D300, it would be a 48 mp camera! If Nikon released this as an $8000 body, the entire medium format market would run for cover. It would also take a lot of the 1Ds market away from Canon, although not all of it, because I'm guessing this camera would be SLOW (not by medium-format standards, but 1-2 FPS, not the 3-5 of the Canons). Since the viewfinder is electronic, it could use zoom lenses as an option, which are a real pain with optical rangefinders!