Oppo released a new ColorOS 2.1.0i UI based on Android 5.0 Lollipop which is as of now only available for two flagships, Find 7 and Find 7a. Oppo has also released a intro video showing ColorOS 2.1.0i in action. Take a look:
According to the video, there seems to be huge changes done in user interface overlay. They have bring the popular Material Design effect of Android 5.0 in this new UI, with new smaller icons, new wallpapers, and more. The subtle changes of the small icons make the whole system looking much more appealing.
Also for better performance Oppo has removed handful of features in order to optimize the RAM and discard the resource hungry functions. So it clearly indicates that Oppo now wants a lighter, faster and Stable OS with better battery backup.