I don't think the images in the trailer will be used in the film. I personally think the ship will be built in orbit--only because the ship always looked to me like something that took advantage of a zero-gee environment.
But as far as canon or continuity is concerned, even if the film doesn't make the slightest mention of ENT that wouldn't mean that ENT didn't happen. It'd be different if the movie said something like "There was no Starfleet prior to the Federation," but I don't think that's going to happen...
Free your mind, and the rest will follow.