According to the listing, it has 2.02GHz octa-core Snapdragon 625 NSN7853 processor with Adreno 506 GPU. It runs on Android 6.0.1 Marshmallow OS out of the box.
There are speculations that Xiaomi Mido could be the 2GB RAM variant of its upcoming Redmi 4 phone. Other details are not known about the phone.
We will keep you posted as soon as we get more info about the handset.