I doubt Naruto will confess. In fact, there really is no reason to. Sakura already knows Naruto loves her. The false confession, while ultimately false, was not without its truths. Sakura was right when she said Naruto was always there for her, always by her side, always looking out for her. She didn't just make that up.
What NaruSaku needs, all it really needs before we jump to the epilogue, is a meaningful gesture, either from Naruto to Sakura, or from Sakura to Naruto.
Granted, I am hoping Kishimoto will approach NaruSaku from Sakura's perspective. I want her to remember Naruto saying how she liked Sasuke and promising to bring Sasuke back; I want her to to remember Sasuke telling her Naruto risked his life to save her from Gaara; I want her to remember Yamato about to tell her what she really felt about Naruto; I want her to remember Sai telling her she was gentle when it came to Naruto and that he really loves her and intends to carry the burden of his promise for the rest of his life - I want Sakura to reflect on all of this and more, and then I want to see something between them.
I don't actually necessarily want her to tell Naruto she loves him. I'd be delighted if all that happened between them for the cut to the epilogue was a hug, a squeeze of the hand, or, and this would really be the best, a call back to the bench scene of Naruto complimenting her on her forehead and kissing it.
The build up to NaruSaku simply isn't deniable. All Kishimoto has to do is stick the landing, and I have faith he will. I didn't before, but I do now that he resolved the most anticipated fight of the manga in 5 chapters to satisfaction.