The update brings a number of new features, but the most important is likely the ones related to privacy.
The update brings:
1. Picture Password for Maximum Privacy
Tap 3 locations on a picture to set a picture password when you open your browser.
2. More Choices for Offline Videos
Now, you can choose the quality of the videos you want to watch offline.
3. Background Downloading
We created a new Downloader to supports background downloading under 2G connections.
4. Cortana Support
Use Cortana to control UC Browser via voice commands.
Thanks shriganesh for the tip and screen shots.