UPDATE: After Alienware's Concept UFO made the splash at CES, I wondered what happened with this device. And from a quick search I noticed there was a further update/leak posted during my hiatus. To keep this thread current, I am updating the OP.
GPD's CEO was at it again past September uploading even more pictures of this device to Baidu. Details of the device was not given, still it looks like a tablet slightly smaller than the Switch, it could even be a phablet. Pictures below show the slots for the joycons. Also no clue if it will run Windows or Android OS, but my bet is on the latter.
GPD has made a name of itself with their portable handheld computers. Initially the company started with Android gaming devices, and it looks like GPD might be going back to its mobile roots.
The CEO of the company, Wang Wade, has shown off a prototype on Facebook that looks inspired by the Switch.
Could this be an Android or Windows device?
Joy-con inspired controls for the win!
Note the rear camera, and what appears to be a sturdy kickstand?
Look at the vent at the top, and what appears to be ports at the top?
Maybe this one can charge while in kickstand mode.