Here's what I think they should do for the trailers. This is just covering the teaser trailer and the official theatrical trailer.

In the teaser trailer, very little footage from the movie is shown. It's mostly just the girls talking about how even though their first movie had bombed they're still making a sequel anyways due to popular demand, and they promise this movie will be better than the first one. But of the actual footage from the movie shown, the Powerpunk Girls are featured prominently in these clips. The Rowdyruff Boys are also shown in one clip, but that's all that will be seen of them in this trailer. Bunny doesn't appear in this trailer, and there aren't even any hints in it that she will be making her long-awaited return in this movie.

The official trailer will have mostly footage from the movie. The Rowdyruff Boys do get more screen time in this trailer, but it doesn't give any indication of their role in the movie, mostly to avoid spoilers about what they're going to do at the end of the movie. Bunny also appears in this trailer, and I even thought about how she will be revealed in this trailer. In the middle of the trailer, the music abruptly stops and we see a shortened version of her first scene in the movie when she shows up at the front door and the girls are shocked to see her again. I figured that the trailer should do this because that way it will make her return more surprising and because I think it would make reaction videos to the trailer more fun to watch.