The latest leaks suggest that Xiaomi will launch the upcoming "12 Ultra" as the Mix 5 Pro instead. Now, a new tip indicates that it will be the second flagship from the OEM to debut with one of its in-house image signalling processors (ISPs) - maybe even a new one. It might enhance the work of 3 high-end rear cameras.
https://www.notebookcheck.net/The-Xiaomi-Mix-5-Pro-will-launch-with-a-second-gen-custom-ISP-for-its-top-end-camera-hardware.591427.0.html