We've been told that NDA/embargo will expire in September for the Canon EOS 7D replacement as well as a new telephoto lens.
Photokina starts on September 16, 2014. So I suspect the embargo date will either be Tuesday, September 9, 2014 or Friday, September 12, 2014. The EOS 5D Mark III was announced on a Friday.
We weren't given any specs at the time of writing this, or what the new telephoto lens would be. I think everyone is hoping for an EF 100-400 replacement.