Gizmodo has a Hands On D3 and D300 Impressions (the latest Nikon digital SLRs) from a Nikon event. Both cameras are 12mp cameras, the D300 being APS sensor size with 5fps and the D3 being a full frame body with 9fps. Awhoooga!
...when I fired the D3 on burst mode, I felt like Arnold firing the minigun in T2 between the rapid clacking and the weight.
Somehow my 6mp 2fps Pentax *ist-D is starting to feel very, very wimpy :(
DPReview also has their own previews of the D300 and D3.