On PTR3 I think the (main) buttons have a new, somewhat faded color.
-personally, I really like them.
I still hope that you will go back to the first of the new GUI's, where there was two solid button "bars" in top/bottom.
(basically like it is on the Mobile .app).
And, also, I would REALLY like if you could somehow hide the current bonuses. COMPLETELY. Not just a bit.