Olympus has just registered a new camera code IM015 in Indonesia certification bodies. This camera could be announced in next 2 or 3 months. IM015 could probably be upcoming OM-D E-M1 Mark III or OM-D E-M5 Mark III.
Olympus hasn’t announced any cameras at Photokina 2018 in September. But a good news: according to 43R, Olympus will announce a new high-end OM-D series mirrorless camera in January, 2019.