The new UI looks like an art piece created by artists rather than a practically designed interface. It really lack of design sense. Some points as follows,
1. Most critically and commonly used "Main Menu" is hidden.
2. More additional clicks are added which make the game more tiresome to play in long hours.
3. Space are wasted for unneccessary beautification like the tips of toolbars and the main menu icon. Reduced the viewing size of the most critical actual gaming environment. It's hard to enjoy the game when view is blocked.
4. The changes are too drastic. I would say it's like Apple interface change to Windows ME interface, very different.
Additionally, different items color background are too overwhelming. The previous color system is still much better. Also enter a quest becoming very confusing with too many options.
The UI looks 1/2 done, aesthetically done, user-friendliness and practicality not there yet.