The Redmi Pro was an experiment by Xiaomi - it used a China-made OLED display and a dual-camera. Now its successor is on the horizon and a screen snap that (allegedly) shows its specs. The Xiaomi Redmi Pro 2 drops the dual camera but its single digital eye on the back uses a better sensor - the 12MP Sony IMX 362. This is a 1/2.55" sensor with large 1.4µm pixels and Dual Pixel autofocus. That's a good deal better than the 1µm pixels that the Mi Note and Mi Mix got. Other changes include a larger battery, 4,500mAh (up from the already ample 4,050mAh), and a version with 6GB of RAM....
Source: http://www.gsmarena.com/xiaomi_redmi_pro_2_spec_leak_single_camera_with_dual_pixel_af_bigger_battery-news-23085.php
