I don't expect much from the Donkey Kong coaster either. Based on the plans, it appears to be extremely short. It also looks like the few interior scenes it has will probably be conveyed through video projection. The show building's rooms look too narrow to fit much physical scenery.
The scenery of the land itself will probably provide most of the scenery of the ride. I'm getting 7DMT vibes from this. And while I hope the exterior is at least superior to 7DMT (wouldn't be hard to top that as the exterior of 7DMT is quite bland), I don't really have much hope that the interior scenes will be anything special. And this is coming from a massive DKC fan who grew up with the SNES games and always figured the mine cart levels could make for a great theme park ride. So far though, I haven't really been impressed with anything i've seen from Super Nintendo World.