The blog TigerMobiles claims to have dug up a couple of patents that may show the directions in which Xiaomi intends to take the foldable trend. One shows a clamshell design like that of the new Motorola Razr, whereas the other is more like the Huawei Mate X, but with an impressively extensive pop-up camera.
https://www.notebookcheck.net/Xiaomi-may-be-working-on-its-own-Razr-esque-foldable.442798.0.html