ZTE's sub-brand Nubia came out of the blue with a teaser for a flexible smartphone that will be unveiled at MWC 2019. Unfortunately, the "Flex Your Life" headline doesn't say much. While this can suggest something different than a foldable handset, most major brands are expected to unveil such a device later this month in Barcelona.
https://www.notebookcheck.net/Nubia-teases-flexible-device-in-advance-of-its-MWC-2019-unveil.406626.0.html