Not to go too enthusiastic on the Valve cocksucking here, but I'm really thrilled that they apparently have rethought the very fundamentals of controller design with this. I got shouted down a couple months back when I openly questioned why we still had a d-pad on our controllers and what the "stick + 4 buttons" design on each side of the controller was really for - the most common reply was "that's just how it is" and I was a bit down that I didn't feel like I could think these ideas through to their conclusion with others.
Now Valve comes out with their vision and it's basically telling me "yeah bro, we wondered about that, too" when no one else really wanted to hear about it. No matter if it's going to be a success or a spectacular failure, it kinda makes me want to cheer for them.