According to a recent trademark filing with the European Union Intellectual Property Office, the next-gen Huawei Mate device will be the Mate 20. This is still a bit far from an official confirmation, but it definitely minimizes the chances to see the Mate 11 showing up first, as some rumors have been suggesting.
https://www.notebookcheck.net/Huawei-trademarks-the-Mate-20-name.315634.0.html