There are a few reports out there that Sigma will finally enter the cinema lens market, and we could see some kind of announcement ahead of Photokina in September.
The subject came up back in July 2014 in an interview with Sigma CEO Kazuto Yamaki, who gave the standard “no comment”, which is generally a confirmation of sorts.
Photokina does seem like an odd place to announce a new line of cinema lenses, however we could get a development announcement of sorts and then the big splash could come in April at NAB.