The latest rumors are that Nikon will release new D5300 and D610 DSLR cameras. I am still working on the details, but such announcement will be within the new company strategy to concentrate on entry level DSLR models. The D5300 will most likely be a marginal improvement over the D5200, maybe with built-in Wi-Fi and GPS functionality (just a speculation). The D610 is the more interesting development. I think the main reason behind the D610 is not so much to introduce new functionality as to kill once and for all the D600 sensor oil issue that prevented many people from buying it. Think of it like the SB-910 flash release - it did not have any major new features, it just fixed the overheating issue of the SB-900. This explains also the recent massive discounts on refurbished D600 cameras.
Needless to say that everything at that point is just a rumor with my own interpretation as to what those cameras will be. If you have any more details, do not hesitate to contact me (no email address required) since reliable information has been scarce lately.