Zenfone 3 is coming out with Asus ZenUI 3.0 which have some cool features but still second generation devices are stuck in ZenUI 2.0. So now Asus is planning to also release ZenUI 3.0 for second and first generation phones but it is in Beat stage.
This is a BETA version that why all features are not included. But you can see when you move your phone your wallpaper will be also moved by Motion Sensor, Some Icons are updated.
Download and Install.. Have fun.