Don't want controller themed Ui? Use a keyboard. It's more efficient.
Not for me it isn't. During Beta I tried playing this game with a keyboard and mouse only and I hated it. I immediately researched and taught myself how to set up the needed third party programs and created a controller mapping that specifically suited my needs.
I have been playing this game for over a year and a half without a controller themed UI. I don't want a controller themed UI and I shouldn't be forced to have it just to continue playing the game the same way I have been all this time. They NEED to make it optional, and not using a controller to play the game is NOT an option.
I am betting that it will be optional and you will still be able to use third party. The reason being that it will likely be native for Xbox One and PS4 controllers. I use a 360 controller.