Redmi's General Manager has announced to his Weibo followers that the Redmi K50 series will launch 'very very soon'. In the meantime, leaked case designs appear to show the Redmi K50 and Redmi K50 Pro's rear design, which includes three cameras.
https://www.notebookcheck.net/Xiaomi-Redmi-K50-series-confirmed-to-launch-very-very-soon-as-case-designs-leak.598243.0.html