"NARUTO ga HINATA to isshou ni narukoto wa kekkou hayai dankai de kimeteimashitane. Dakara koso NARUTO to SAKURA ga kuttsuku ka no you ni MISLEAD saseru tame ni, aete SAKURA to NARUTO no hahaoya de aru KUSHINA no ugoki kaneru ka no you na SCENE wo egaitari moshitan desu."
short version :
Naruto ending up with Hinata was decided in the very early stages of the story.
Naruto being close to Sakura was a deliberate mislead, that was the entire point of the scenes of Sakura being compared to Kushina, for exemple.
The Last Movie is not only the story of Naruto falling in love with Hinata, but it is the story of Sakura & Naruto parting ways.
He felt the story of Naruto falling in love with Hinata has to be propely explained, or it wouldn't be fair to the readers. That's why the Last Movie exists.
Shit just got real. I can smell the shitstorm coming.
EDIT : I gave the interview to two others translators outside of the Naruto fandom, just in case I got something wrong.
EDIT 2 : Pretty much 90% confirmed.
EDIT 3 : 100% Confirmed, retweeted by the Official Naruto Twitter Account.
As for the movie, its main intention is to finally obliterate everything about the thought that Naruto liked Sakura and to properly explain how Naruto fell in love with Hinata so as to be fair with the readers.
Well, what more can I say? It's technically endgame even before the shipping wars started! Nothing less from the most strategic manga-ka of Japan! LoL
But seriously, it's really amazing how Kishi defended NaruHina and clarified everything about his real intentions with NaruSaku. At least NH fans don't have to waste their effort and time debating with NS fans because the creator himself had already spoken up on their behalf. No offense to NS fans, but it just goes to show how smart and more logical NaruHina fans are because they were not deceived by Kishi's misleading plot ;)