Typical Canon.
A lot of MP for the $$$ and likely sweet IQ at lower ISOs, but no gapless micro-lenses, same old SI-screen VF, I understand same 5D mirror box (issues with alt lens - not that Canon SHOULD care), no real weather sealing, tweak to fps (not a biggie for me anyway), same 5D body, AF sys (according to RG and Chuck W) is the same. Video - who cares? New LCD - but old one was getting to be a laughing stock anyway.
Bitching aside, it's a nice camera for the $$$ and while the fan-boys will go nuts, it will fill the needs of many real photogs (vs gear nuts). That said, it would have been nice to see Canon change it's stripes a bit and offer say 16 or so fatter pixels, ditch the video and up the snack-bracket of the WS, VF tech, etc. Make the 5DII to the 1Ds3, even with fewer MP, what the D700 is to the D3.
I would not want to be a 1Ds3 (studio) shooter this a.m. (not that you couldn't have seen it coming). Their $8000 body HAD dropped to $6500 or less used and can now be matched (lot of IQ assumptions here) IN THE STUDIO (where WS and uber-AF are less of a concern) for a sub $3000 body. Nice. Very nice.
As for ISO 25,600 - w/o gapless lens tech and 21MP I'll reserve judgement until I see tests beyond the typical "who did these and why..?" sample shots Canon sticks up. My hopes aren't high.
Let the various B&S forum 5D Mk1 tsunamis begin.....