I'm a little concerned that it will be a 100+ hour game like Skyrim and Fallout after seeing the second trailer. I try to stay away from those types of games these days.
I actually got to play it for about 20 minutes and it is indeed very much like Skyrim - At least as far as the over-world is concerned and that includes menus and maps.
I played it on the Wii U and there was no choppiness. It was very smooth.