A Huawei executive has reportedly been quoted as saying that the next generation of the Mate premium phablet line is indeed destined for launch in 2022. Furthermore, its series might not be confined to this form-factor next year: it just might be joined by the rumored "Mate V" clamshell foldable.
https://www.notebookcheck.net/A-2022-Huawei-Mate-50-launch-event-is-on-possibly-followed-by-one-for-a-foldable-sibling.583500.0.html