https://www.cnet.com/news/huawei-mate-20-pro-launch-live-stream-start-time-what-to-expect/

In terms of design, the phones are expected to be large -- with some rumours pointing to a whopping 6.9-inch screen on the Pro model -- but with an edge-to-edge design, complete with notch at the top. 

With the camera, Industry leakster Evan Blass posted images of the phone sporting a square camera unit on the back containing three sepearate camera lenses and a flash, as well as Leica branding. That's not particularly surprising, given the Huawei P20 Pro already has three cameras. We'll have to wait and see whether the Mate's cameras operate in the same way as the P20 Pro.