During the Mate 20 Pro launch event, Huawei's CEO was asked about foldable handsets. Richard Yu confirmed that the company is working on foldable phones, also adding that these handsets feature 5G connectivity. Sadly, he did not reveal any other technical details or a launch date, but previous reports mentioned June 2019.
https://www.notebookcheck.net/Huawei-confirms-to-be-working-on-a-5G-foldable-phone-release-date-still-unknown.339616.0.html