This actually looks really cool, it's definitely way more than just a run-of-the-mill 3D World expansion. Props to Nintendo on this one, I wasn't really planning to pick this up but I might have to now.
I might pick this up but I'm honestly a little worried that the expansion will last maybe an hour or two. I saw what looked like two "worlds" in the trailer, and if that's all there is to "Bowser's Fury" then that's a little disappointing. 3D World itself is a good enough game though, and it'd be good to have it handheld.