Xiaomi has officially released the Kernel source of Redmi 3S/Prime/3X as a new year gift from the company.
Individual Android Developer will have a chance to further development/improvement of the ROM.
Moreover, third party custom ROM builders such as CyanogenMod, Remix OS will be able to release their official version for Redmi 3S/Prime/3X.
Xiaomi Redmi 3/3S/Prime/3X are the wallet-friendly smartphone from Xiaomi which is announced on early 2016.
As the official Kernel source is released, Redmi 3S/prime/3X users can expect Android Nougat based ROM in near future.