Huawei usually launches premium mobile devices known as the Mate series in the third quarter of the year. However, according to the latest word from the Chinese media, an upgrade for the current 40 line will not be forthcoming this year, as the OEM may prefer to focus on the P50 series and existing customers instead.
https://www.notebookcheck.net/Huawei-will-not-update-the-Mate-50-series-of-phablets-this-year.545945.0.html