Xiaomi patent has recently leaked and this revealed the new and one of the different and bold designs and this is the first one whose design looks like and its title is MI MIX 2020.  The phone has a full-screen display, but it does not have any camera in the front of the MI MIX 2020 and have not any notch in the display. The difference in this MI MIX 2020 is that the MI MIX 2020 has a second screen in the back of the MI MIX 2020 below the camera setup.

Mi Mix 2020 Patent
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The second the screen is of a halfway size between the Moto Razr 2019 second screen and the Samsung Galaxy Z Flip. It will be able to display the time, the date, the weather and likely other information like notifications.
From this we at least know that the MI MIX 2020 using a full screen without any camera in the front of the display or any notch or any other design of the camera. The leaks do not clearly claim about the POP-UP camera in but this all shows that the MI MIX 2020 may have an In-display camera or in build camera in the screen of the MI MIX 2020.

The estimates also claiming that the MI MIX 2020 may have only a rear camera in the back of the MI MIX 2020 and it also use like the selfie or a front camera of the MI MIX 2020 therefore, they provide a second screen in the back of the MI MIX 2020 to check the view or adjust the picture during clicking the selfie or a face picture.

Like all other companies now working on new folding phones suck like SAMSUNG folding phone and Motorola and many other companies also work on this type of phone and want to settle their market in these segments of the phones. But Xiaomi always do and provide some different things or services from other companies.

Note that it is still a patent and whether or not Xiaomi chooses to actually build the device is entirely up to them. The company may even choose to make the device but face complex production issues if they choose to put in elements like an in-display camera. These could delay the device actually coming to users after launch.