From bythom.com:
The long-rumored Nikon F6 becomes at least a partial reality. Nikon"s relied upon the same autofocus and metering technologies for quite some time now. The F6 project was to develop and showcase the next generation of Nikon camera technologies. So one of two things will happen soon: either the F6 will actually show up as a surprise (and once again catch Canon off guard, this time in the film realm!), or the technologies will pop up in a new digital body, most likely the D1h/D1x replacements. [The F6"s autofocus system is in the D2h, so it looks like we get the partial realization for sure. Now, will Nikon surprise us with a full F6?]
http://www.bythom.com/2003predictions.htm