I liked how Joppa commented on the stream about the UI. My impression was they really wanted to stick with one hotbar, were reluctant to add additional hotbars, yet at the same time were agonizing how to involve clickies and other stuff without "having your inventory open all the time" If the unique class heads-up display is any kind of marker as to their ingenuity, I believe they will come up with something good.
I want to see the field, not rhe UI