24th We're told [thanks] that a 'preview announcement' for a high MP camera is likely for September/October, along similar lines to announcements associated with some of the recent EOS video cameras [hopefully not for a timescale like the 200-400 lens] and that it is currently most likely at around 47MP, although 39MP and '50+' versions are in test. The camera is dependent on technologies that will appear later this year in the 7D Mk
So look to the release of the 7D Mk to se what might be in store for the fall from Canon.