Those turns actually look very tight within the show building. Considering how fast another version of this same coaster model travels around corners, this could be a surprise. Then again, they may just want to slow it down to the point where you are focusing more on the FX than the coaster itself. I hope that they give you more than just a split second to enjoy the interior. Besides, launches tend to be one of the more intense coaster experiences and this one already has two. Not bad for a family coaster.
As for the interior, I imagine that the walls showing in the concept art will probably be either backdrops within the building, barriers between scenes, or both. Either way, this one is looking good.