If you werent already impressed with Redmi Note 7s 48MP camera maybe Night mode will change your mind. This update was announced on MIUIs official Weibo page and will be released later (with no further clarification).
The Redmi Note 7 is the first of its siblings to feature the large 1/2 ISOCELL GM1 sensor with 48MP resolution. Individual pixels measure 0.8µm, but they can be binned to simulate a 12MP sensor with 1.6µm pixels.
Xiaomi included four sample shots with the new mode and they are indeed in 12MP resolution.