Board Thread:Theories and Speculation/@comment-25449165-20161013231440/@comment-3261234-20161014121539

That being said, it was only said by Kakashi that he would promote him if he would study hard. If he really did it though can't be known without actually showing it as long as we have canon information that state otherwise. So Kakashi promising Naruto is one thing, but we have to see him getting actually promoted to be able to consider the information we have so far being retconned.