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.
they always have been very consistent these past years with .5 and primary releases in the october - December window. I thought i’d stop upgrading for a while with cubase 8 but they always managed to sneak in a few features that I really wanted cubase to have, not to mention the performance improvements I had since 9. Where I have like 1/3d increase in performance headroom for the tracks that I made on this 10 year old pc. The streamlining of the interface itself in 10 was also a good move.
This is a big reason why, it’s been suggested that exporting to video will finally be available in 10.5, a feature all visual media composers need: Export to video - Cubase - Steinberg Forums