In the vast Weibo, the Chinese equivalent of Twitter, I found an interesting video showing the upcoming smartphone ZTE Nubia until presented by the manufacturer officially. He received a second auxiliary display on the back panel, like the Russian YotaPhone.
The smartphone called the Nubia Z18S YotaPhone is different from at least the auxiliary screen has a color. It can be used for shooting selfies core dual camera.
By the way, the front camera of the smartphone, apparently, is not. The main screen is almost completely frameless and without any cutouts. Earlier it was reported that the smartphone has just two fingerprint scanner — on the right and left edges.