Chinese Android developers have released Android 4.3 which is ready to download and install on the Xiaomi Mi2 and Mi2S.
The stock Android 4.3 ROM was developed by Xiaomi developer @秋叶随风 and is available to download and install on both the Snapdragon S4 and Snapdragon 600 versions of the Mi2.
I was all up for installing the ROM on my personal phone until, however this not being an official update GPS isn’t currently supported, neither are OTA updates the FM radio and the ROM can’t show network speed in the status bar, however it does offer support for OPENGL ES 3.0 which should prove for a silky smooth experience.
For those of you who are more adventurous than I am you can download the stock Android 4.3 ROM for the Xiaomi Mi2 and Mi2S along with GAPPS from the MIUI forum here.
Thanks to Fel for the tip!