Rumors that I'm hearing is that the Nikon camera division might be going the way of Minolta, perhaps to Sony.
Fact is that Nikon's camera division is going better than ever. It would be very surprising if they did anything with Sony, except buy sensors. A much more logical development would be closer ties with Fuji. Fuji uses a Nikon body for their DSLR (which is not very successful, although the S5 might become just that), makes some of the best sensors available, is successful in the p&s market (which Nikon isn't) and makes medium format digital cameras (Hasselblad, body as well as lenses, is made by Fuji and sold under the Fuji name in Japan).