That just probably means that the central plot for this movie will have to do with aspects of the original work, i.e. The Moon's Eye Plan. This will be the first movie that will use an already known threat instead of a completely new one, I think this is what they meant.
Yeah. I'm pretty confident this just means- this is only based off of manga canon material, not that it will be part of the canon story. ie this isn't just whatever crazy idea Pierrot comes up with, it's directly taken off of what has happened in the manga, then given a twist. Look at Tobi Madara's mask- it's the mask Konan destroyed right before the war arc started, not the one he's wearing in the war arc. That makes it look like even before Naruto and Sakura are taken into Tobi Madara's genjutsu it's not exactly current manga canon, but a variant Kishimoto made for the movie. Basically anything after Naruto rescues Sakura from Sasuke could be different in the "real world" the movie starts (and certainly has to end) in.
I don't think Sakura will be any different than her usual self. If she was gonna be affected by the jutsu then there would be no point in specifically mentioning her in the synopsis. It goes to say "Naruto and Sakura are attacked by the mysterious man's new jutsu" and near the end it also mentions something like "Conspiracies surround Naruto and Sakura...", why on earth mention her like that in the synopsis if it wasn't for the fact that she will be facing the same situation as Naruto?
I'm sure that Sakura is meant to face the problem and not just be a part of it like Kakashi, Hinata, Ino and the rest are. The synopsis would be very misleading if she was in the same situation as everybody else.
Yeah, my guess is it's another "manga spoiler" type situation, where Sakura was conveniently left out by either the translator or the original poster because one or both of them wants to pretend Sakura isn't a main character.

I think it's kind of weird that Pierrot sent Inoue (Kakashi's seiyuu) along with Junko (Naruto's seiyuu) not Chie (Sakura's seiyuu) though, considering Kakashi is just going to be a support character this movie.
Edited by ciardha, 06 May 2012 - 08:20 PM.