As I understand it the press embargos for Photokina product announcements all must end on, or before September 15th. So Zeiss, Leica, Nikon and Canon... all must play their cards between now and then.
We know for a fact that Zeiss will announce support for a new mount that day. I know most of the planet wants it to be Canon's EOS but I doubt it.
I fully expect Canon to launch the 5D Mk-II, and I fully expect it to be superior to the D700 on the basis of image quality. However I don't expect Canon to offer truly professional quality for construction and non-imaging features (like auto-focus). That would shock me, frankly.
I've been vibrating with anticipation ever since I heard that Leica & Canon might be cooperating on a new product. Herr Kaufmann promised a significant non-lens announcement for the M system. I think I join many enthusiastic amateurs when I say that I pray for a digital CL... I already know which lenses I will buy if they announce one. One can hope.
I'm not sure what Nikon will announce. I wouldn't be surprised at all, but very disappointed, if the D90 is the only thing they have show at Photokina.
Nine days to go.