According to latest rumors from CR, they confirmed that Canon EOS 7D Mark II and a new telephoto zoom lens will be announced before Photokina 2014 in September.
Photokina 2014 starts on September 16. So the Canon EOS 7D Mark II will be probably announced one week before, maybe Tuesday, September 9, 2014 or Friday, September 12.
Also the new EF 100-400mm f/4-5.6L IS II USM lens will also be announced.
via: CR
Read More: Canon Rumors