Nikon has two ways it can go: It can upscale the 14 megapixel processor with the Multi-Cam 1000 autofocus sensor module or it can downscale the 16 megapixel processor with the Multi-CAM 4800DX autofocus sensor module. Since both are new to their DSLRs, either one is a legitimate strategy and would be popular choices.
If it upscales the 14 megapixel processor, it's a good bet that the LCD will be 920K, and that it will have a stereo plug-in for the video. Whether the LCD will be articulated is less clear, especially since video was fairly new in the d5000 and articulation was likely being tested as a feature. Their market research will give them the answer on this one. Could they have a low res articulated screen and stereo plug-in? That's possible as well? What you almost certainly won't have is dual storage cards, two selection wheels, and the nifty AF selection button.
If it downscales the 16 megapixel processor, you'll lose any chance of a high res LCD and probably the stereo plug-in. Think today's d5000 with the 16 megapixel processor. The same factor applies to the articulated screen as before. If Nikon's research shows it was useful, they'll keep it.
When will it come? Based on past life spans, you can expect it sometime from April to July 2011. Which one will it be? I think this is a tough one because both strategies would likely be popular. Awesome processor and pedestrian supporting cast or good processor and upscale supporting cast. You can probably make a good argument for either. Personally, I'd go with good processor and upscale supporting cast, like a 920K LCD and stereo plug-in.