Yeah, or they could do what the first "Fantastic Four" movie did, and make it seem like the movie is over and then have an extra scene. I like it when movies tease the next film.
So, you could have an epic ending, and then before the credits role, they show a similar scene of Azula from the series. That way, more people will see it, thus it garners more of an audience, and it's a great teaser.