IBC Show 2018 in Amsterdam begins on September 13, 2018 and Canon will have a few Cinema EOS and broadcast announcements ahead of the show.
We're told that Canon will announce new Cinema EOS accessories, but no new cameras. We weren't told what sort of accessories to expect.
Canon will also announce a couple of broadcast lenses, but we don't know the focal length of the lenses at this time.
We have been told that a new Cinema EOS camera body would be coming in 2018, and that it would be a C300 Mark III. However, we haven't heard anything further about a possible new C300.