Here is a list of some of the upcoming/rumored announcements from Nikon, Canon, Olympus, Fuji and Leica:
First leaked pictures of the upcoming Olympus E-M10 Mark III camera
The Canon EOS M10 mirrorless camera replacement will be called M100
List of upcoming Fujifilm GF medium format lenses (6 new lenses, including tilt-shift)
Fuji promises to focus more on video in the future (new high-end APS-C video camera with X-mount?)
Leica is rumored to announce another camera with TL-mount and EVF
Leica Noctilux-M 75mm f/1.25 ASPH lens confirmed – coming later this year
The Russian company Zenit to release a new full-frame mirrorless digital camera in 2018