The specs have apparently been leaked. There was a YouTube commercial of the new camera that was pulled from YouTube. Here is some dirt, though:
Canon 1DS Mk3 (EOS-1Ds MkIII) - replacement for the Mk2
Canon News - LATEST - 23rd - 7D and an announcement tomorrow?
6fps FF camera with 5D sensor (5D+ or the fabled 3D)
1Ds III with 5fps 18MP and 8.5 fps 12 or 10MP (aka 1DsN or 1Ds3)
http://www.northlight-images.co.uk/Canon_1DS_MkIII.html