Samsung's commercialization of foldable displays has been pushed back until 2019, meaning its Galaxy X device will debut at least until then. Samsung mentions the current success of bezel-free screens and a need to improve foldable technology as reasons for the delay.
http://www.notebookcheck.net/Samsung-s-foldable-phone-is-still-coming-but-much-later-than-expected.211316.0.html