We are getting closer to the 2018 Photokina show that will take place in September. Here is an updated list of all upcoming/rumored cameras and lenses:
Sony is behind on updating their A-mount offering and APS-C mirrorless product line but I have not seen any reliable rumors yet. A new Sony A7s Mark III and Sony a6700 cameras are also a possibility as well as some new E-mount mirrorless lenses (200-600mm, 24mm f/1.4 GM).
Olympus may announce a new special edition camera or a lens for their Micro Four Thirds 10 years anniversary (2008-2018) or for the company's 100 year anniversary that is coming next year (October 12th, 1919). Olympus doesn't have a booth at the 2018 Photokina show, so do not expect anything big to come out in 2018. A major Olympus announcement is expected in 2019.