My comments after spent 2 hours yesterday :
1) Extended width of Inventory and Storage : I like !
2) Unified skins on (almost) all windows : I understand the need to unify them. I don't like the fact that visual aspect had received priorty on user-friendly. New icons are white on gray, it looks cool on a screenshot but going from 16 M coulors to 256 grey shades is a loss of information. I'll have to relearn, I accept, but they could have been adapted, not needed to change them totally. Same for Options, Radar and other stuffs where all orders were changed. finally, only the skins were changed, but not the functionalities, and there was room for improvement, like on the Map which is still a pain to use.
3) New mapping system. I think the Action Bars are restricting our customizations. Their management is not intuitive. I miss the keyboard view where we could see what key was still available. Not sure if anyone will use the several Pages, maybe was done to replace the old Sets ? Not sure also if the key combinations with Shift/Ctrl will be used, since we have one hand on the mouse, one on the keyboard, and the range of accessible keys from Shift/Ctrl is limited.
4) I didn't detect any change in performances.
5) There was a little lack of testing.
6) It seems an unfinished work : the HOF window was not reworked, and some old icons remain from PE.