ZTE's sub-brand nubia just teased a flexible device that will be shown at the Mobile World Congress at the end of the month. The teaser's message is "Flex Your Life" and undoubtedly hints at a flexible device. Whether that's a foldable phone or some other device is not clear.
Nubia did tease a curved smartphone for your wrist at the IFA show in Berlin last August, so maybe that's what they'll show at the MWC.
The MWC is shaping up to be a huge event this year. You've got your usual Samsung, Sony and LG flagships that will be unveiled but you've also got a heap of foldable devices scheduled to appear, from Samsung, Oppo, LG, Huawei and even Energizer.