I doubt it's Naruto & Co. Especially the way the played it up.
Usually Naruto always arrives in the last minute, but that won't be the case here.
1st of all, Pain has already made his move & fired his jutsu, if he was going to come he would've come in time to repel it.
2nd of all, you guys did see that he wasn't ready, the kid didn't even have his shoes on. He looked like someone who just woke up, he was a mess.
So whoever these new guys are, it's not Naruto.
Maybe it's Gaara, Temari & Kankurro!?
Kankurro wears several scrolls on his back. I hope it's them.