According to the Taiwan Electronic Times, Xiaomi has reached a secret agreement with TSMC, which will produce the S2 processor based on the 16nm process.
From the previous exposure, the S2 is based on TSMC's 16nm process and is still an eight-core design. It contains four A73s with a frequency of 2.2GHz and four A53s with a frequency of 1.8GHz. The built-in GPU is a Mali G71MP8. UFS2.1 and LPDDR4, do not support CDMA network, the performance is flat with the Unicorn 960.
For the specific details of S2, there are industry chain sources, Xiaomi has prepared several alternatives, so what is ultimately the case, when released is unclear, but at least it is certain that the processor will also Go ahead, and invest more energy.