The Nikon D90 replacement may have a 100% viewfinder coverage and dual memory card slots. FYI: the current Nikon D90 has 96% coverage and the D300s has 100% coverage. No idea if the dual memory card slots will be SD+CF, like the D300s, or only SD. I cannot give any rating for this rumor, since I found it online - it was indirectly mentioned on a website by one of the people I have been following for a while.
This is a good news for all DX users. If the new D90 gets better specs than the D300s (and so far that appears to be the case), I would be very curious to see what the D300s replacement will look like when it comes out next year.