The Xiaomi Mi 9 is likely to be the OEM's 2019 flagship. Earlier leaks indicated that it will incorporate a triple-camera set-up, as well as the Snapdragon 855. Gizchina claims to have access to an exclusive 'report' that shares more details on the Mi 9. They include an in-display fingerprint sensor, a waterdrop notch and a starting RAM SKU of 6GB.
https://www.notebookcheck.net/Xiaomi-Mi-9-specs-leaked-in-new-report.391381.0.html
I will install this in my living room to watch some movies on it. I think 6.4 inches are enough.