If legit, the images reveal that ColorOS 3.0 will be flatter, offering a comparison to Xiaomi's MIUI. The ColorOS 3.0 UI is based on Android 5.1.1, and features a new dialer with a Yellow Pages function built in. A small arrow at the bottom left corner of the screen allows you to hide the on-screen buttons.
There is no word on when we might see ColorOS 3.0 UI introduced to the public. We do have quite a few leaked images of the UI that you can take a look at by rummaging through the slideshow below.
source: MyDrivers (translated), XiaomiToday