In a nutshell here it is..

I really love the new UI, here is a list of both the things I like, and don't like and how I believe they could be changed.

-What I like-
Love the new style
Love the design of pills and items
The HP meters are awesome both for Player and for enemies.
I love the map view.
Over all the game looks much more appealing.
Love the ability to hide menus.
Finally, I can run back to ready room. Thanks.
I think the ability to zoom in is one of my new favorite features.

-What I don't like-
I don't like the name tags on players, displaying ranks will only invite beggars, and everyone with white names is boring. Although it is easy to spot friends and guild, I feel it just isn't quite the same without the personal colors in use. My suggestion would be for these: Allow the player to choose to display their rank or not, Make only the guild title blue or green for friends and guild, leaving the name the knight's personal color.
I miss the ability to move pills around. I am usually very picky on where my pills and vials are so the quick key is easy to remember.
I also miss the colored dots on the map. Even if they are faded to show they are not on friends or guild, it would be nicer to have personal colors. Maybe a blue or green boarder around the colored dot for friends and guild would work better.

-Possible bug-
When in a party of multiple players, it seems the player just under you isn't clickable.

Over all I love the new UI and prefer it over the old one. Although I know not everyone will agree, for this reason I would suggest the ability to keep "classic" mode. I personally will be using this new UI, I love it :)