Actually, the more common movie methods in anime is more of a summery of the series.

I reckon it will just be the series, but shortened exceptionally to fit into the same amount of time as a movie. Basically, only the most important parts about Naruto the main character. Probably a brief summery of the first episode, followed by the Chunnin exams, followed by whatever comes after the Chunnin exams, and the final fights. Then a quick summery of the end.