While Samsung, LG and Motorola are planning to release foldable phones next year, Chinese companies like Nubia are pushing for late 2018 releases. Even if it's not a full-fledged foldable phone, the Nubia Alpha bracelet concept showcases an interesting take on flexible displays. Specific details on hardware specs are not yet available, but the Nubia Alpha should launch in Q4 this year.
https://www.notebookcheck.net/Nubia-showcases-bracelet-smartphone-concept-with-flexible-display.328682.0.html