If using DIGIC 4 I don't expect any great improvements in high ISO image quality, not in RAW files. JPEGs might be improved via software algorithms.
18 Megapixels in APS-C seems overkill and this is suprising. Given the target market (sports/wildlife) I would of thought 12 Megapixels in APS-C was about right.
Shame it is not APS-H based, but this would be too close to the 1D series I expect.
100% viewfinder, very nice.
AF sounds excellent (if not crippled in some way, I don't expect so)
Dual slot? Can't see that mentioned but was in rumours, maybe confused with dual DIGIC.
Overall this looks like a direct response to the D300 with a couple of clear marketing features to distinguish it (full HD video and 18 megapixels).
Looking forward to the full spec and reviews of the camera.
Sean