no shit it will be able to have Aperture mode and shutter mode, that what SLRs are -about-
12mp, maybe. but video mode is just over the top. if you want video mode and pro-looking photos get a Canon G9

and i think that they may up the fps rate in the 450d, because that was one of the biggest downfalls for me as a photographer with the 400d - and also look for ISO 3200 via cf.

i dont think there will be much difference between them