Like most software companies, Steinberg do not announce upcoming products until they are close to release.
If recent history is anything to go by, Cubase 10.5 will release some time in November or December. The feature set is unknown at this stage. It is possible that there will be a break with the practice of recent years, because Nuendo 10 has just been released and this release unifies Nuendo and Cubase to a much greater extent than before.