As per the listing shown on GearBest Mi Mix 2 will come with SD 835 with three RAM & storage variants one with 4GB RAM+64GB storage, 6GB RAM+128GB storage & 8GB RAM+256GB storage options.The main camera will be of 19MP and front camera of 13MP. It is having 6.4 inch AMOLED display with resolution of 2540x1440p. It will be fueled with 4500 mAh battery.
The dimensions which are shown in the listing looks similar to last years Mi Mix. So most probably it is fake render details as Mi 6 & Mi 6 Plus will be powered by the same chipset SD 835. We have to wait for Xiaomi to launch it officially.