I don't even think there's a actual love triangle in this series. NaruSakuHina has Naruto loving Sakura, Sakura growing feelings for Naruto, and Hinata having feelings for Naruto who has no interest in her. NaruSakuSasu has Naruto who still loves Sakura, Sakura who was in love with Sasuke, and Sasuke who could give less of a kitten for Sakura. A normal love triangle would have Naruto & Sasuke both having feelings for Sakura, or have Naruto have feelings for both Sakura and Hinata. Since this isn't the case at all, that means NaruSaku's the only two-sided relationship in the manga out of the big 3, so I really don't see anything to worry about in terms of who will become canon before the movie.
Not the main series, we're talking specifically about the movie because there hasn't been any new info.
Interestingly, Kishimoto refers to the Team 7 Naruto -> Sakura -> Sasuke situation as a love triangle, in the old interviews.