The buildup is in the movie.The movie covers the blank time period of the manga
The manga is the story, it's supposed to stand on its own. I doubt Kishimoto would rely on a movie to address something when he could just address it in the manga. It simply looks like he's not willing to address it at all, which is not surprising considering the kind of manga this is. IF Naruto was going to confess, there would be some indication to it, such as the Sai flashback being brought up again to remind the readers. The way I see it, it's very likely this will just be ignored in favor of a "you decide" ending (and SP may just decide it for us).
@above: Naruto's son can look exactly like Naruto.
Edited by Ether, 29 October 2014 - 02:47 PM.