Digital Rev, which is not used to propagating false rumours (or any rumors at all, by the way) up to now, just published a small article explaining why there will be no Nikon D700s (a minor improvement over the current Nikon D700 Full Frame DSLR camera): It would not be powerful enough to kick the very successful Canon EOS 5D Mk II (Sony probably has the same issue in order to provide a sibling to the Alpha 900/Alpha 850 offering; Pentax solved the issue by looking at a larger format in the 645D).
Instead, they would be preparing a new and better Nikon D800 with a much more powerful set of features:
- Full Frame FX CMOS 16 MP photo sensor
- Sensitivity: ISO 200-12800 (ext. to ISO 102400)
- Continuous shooting at 9 fps (or 11 fps in DX mode)
- Autofocus system: Based on the 3500FX 51-point Multi-CAM
- Full HD video
- 3″ (921,000 dots) VGA LCD
In any case, I would not expect this for the short term. Not before beginning of 2011.