There are only a couple of phones that can be configured with 16GB of RAM and there isnt a Xiaomi among them. Not yet anyway, as leakster Digital Chat Station teases that the company is working on just such a model.
Earlier this year there were murmurs that the new Mi Mix model will have 16GB, but those quieted down. The Mix does make sense though, as that is Xiaomis halo series. Alternatively, the Mi 10 Pro was also rumored to have a 16GB option, but that never materialized.
12GB has become pretty common, its even available on some fairly affordable models. Samsung started manufacture of 12GB LPDDR5 in July last year, mass production of 16GB packages started in February 2020. However, Xiaomi partnered with rival Micron to source the LPDDR5 chips for the Mi 10 phones. Micron stated that it expects 16GB phones in the second half of this year.
Anyway, we havent heard any solid info on when the next Xiaomi Mix might launch, even the Mi Mix Alpha hasnt launched yet or any other Xiaomi worthy of 16 GB RAM.
Source (in Chinese) | Via