The new UI's graphic is horrible.
Cards are cut to squares (instead of rectangles) and the game board itself is smaller, the results are that after a little while eyes start to hurt...you often have to painfully narrow your eyes to understand what is what.
Also, the cropped cards are much worse to see than the original. Probably because the original art was thought for a rectangle.
It's a waste of otherwise spectacular animated art, this version.
I think we cannot truly appreciate it in square size.
During the game the cards move too quickly, reaching their row in a nick of time which is much less beautiful to view than now.
A smooth movement (even if fast) from hand to board would be much better.
The speed of the cards, too, tires the eyes a bit.
Mulligan and the window which opens upon Create ability is rather bland, looks like a hard downgrade.
I understand it's thought for a mobile game, but PC users should be able to opt for something more beautiful.
The deck builder is very nice, fast and efficient.
Browsing one's collection or building a deck became a pleasure instead of a long process.
It would be useful to be able to set the default of what you will see when you open the tool (like: Bronze, Monster, Premium, Owned)
Visual effect during the match are elegant to see and useful to understand what's happening.
However, because of the fast card speed, it's often hard to see what the opponent just did (like when he plays a card that Creates, makes a hidden selection, and a Created unit reaches the board and uses the Deploy ability; we all see a face-down card standing still for several seconds and then BAM!).
TL;DR: Visuals are bad, there should be two separated versions, one simple for mobiles and one heavy with graphics for PC/consoles who want to enjoy the art.
The new changes to collection viewer, deck builder and effects during the match are all very neat.