Basically, the point of the movie, like the point of 90% of all anime action movies, is to have the original artist (or a reasonable facsimile) produce (usually) high quality art and animation of the main characters kicking a lot of non-descript non-reoccuring ass. It's designed to have the traits of 'badass' and 'wow that was cool looking' without anyone having to worry about anything unnecessary like 'good writing' or 'fitting within the timeline', while still giving them the ability to make money off of it. Dragonball Z, Inuyasha, One Piece, all the more popular 'action' animes follow this method too. Fortunately, Naruto is milking it a WHOLE LOT LESS than they have done so far. (5 One Piece movies? 1 Dragonball Movie, 13 Dragonball Z movies, and I heard the 4th Inuyasha movie is in the works? ouch.)

My guess would be that they will attempt to invoke fear of the main enemies by utilizing the fact that Kakashi couldn't beat them all at the same time when he was in the anbu, 4 against 1. Logically any 4 people that can team up on a weaker less experienced Kakashi that may or may not have the sharingan and manage to drive him away from their village without wounding him, makes them kind of possibly scary maybe. I think. Then again, maybe they just said "Yes I was in the anbu once, now let's kick their asses." which wouldn't be unusual for a movie. We'll wait and see how it works out. Oh, and the other thing, in any anime movie whatsoever, the main character has to be the one that saves the day. Keep that in mind.