NikonRumors just gave us a few more rumors for new DSLR releases to come from Nikon next year. Among them is a claim that the D7000 and D300s lines will be consolidated into one semi-pro body APS-C camera that will sit just between the D5200 and D800...
A D4x, whatever it will be called, will likely include the D800's 36MP sensor or an entirely new -- get this -- 52MP sensor! That's crazy, if you ask me. But it's certainly in the direction in which things are headed. In any case, it will be interesting to see how Nikon handles low light in a camera with a sensor that packed with pixels (it won't be far from the same pixel density as some of these smaller cameras with 20+ megapixels).
Lens rumors are scarce but include the introduction of an even more improved VR system in a new 80-400mm lens that Nikon might introduce. We'll be waiting to hear more on that.