The rumors can be little but significant just read and know the present and future strategies of the Sony, Fuji, Olympus and Sigma.
Sony: Sony is in a plan to announce a new A7rII and a new 50MP A9(?) camera in the days to come.
Fuji: Somehow possibilities of New 2x converter to come and a new sensor to support 4K video.
Olympus: The E-M1II could have a new 1/32.000 electronic shutter.
Sigma: A new 24mm f/2.8 ART lens will be released in September as per reported by Sigma Rumors.