First thought, since it is not DBZ we can at least count on them not having to go all Lord of the Rings with three 2:30 long movies to capture the proper length of a single power-up session.
Long power-ups were only really present in the anime as "filler" content. Power-ups takes a few seconds in the manga, if that. Since the movie doesn't need to add minutes to its length, it likely will be more like the manga in this respect. Additionally, there is no powering up in Dragon Ball.
They should have made it more kiddy and based it on a shortened Red Ribbon Army saga, with Tao being the central villain.