I think it's interesting that Nikon has taken a page out of Canon's playbook and branded their DSP. Canon has been convincing their faithful that "Digic" is somehow special for years now; Nikon decided that it needed to be equally special with "EXPEED". Both are meaningless; all cameras have pieces whether they name them or not. Perhaps soon Nikon will relabel some of their lenses "L". They already paint the rings.
I'm pleased to see the 14 bit processing and intrigued that Nikon allows you to disable it. We'll get to see how valuable it really is, particularly on the DX model. Nikon has also added lossless compression without giving up their lossy compression option.
It's odd to see Nikon with a 20% pixel count advantage in both cameras they directly compete in. I wonder if that really matters for the D3/1D3 just as I wonder if 9 vs 10 frames really matters. At least Nikon's PJ camera doesn't appear to be an embarrassment anymore.
The near-megapixel 3" display is interesting. I'm sure it will look nice but how important is that really? Still, can't complain. I wonder if Canon will switch to it before the 1Ds3 is announced.
It appears that the D300 does not use the Sony sensor recently announced though it could be a derivative.