As previously reported, Persona 3 is getting the movie treatment. The first Persona 3 movie will be released in Japanese theatres this Fall, and is titled Persona 3 the Movie #1: Spring of Birth, according to its website, which was updated today. The Persona 3 protagonist has a new name for the movie—Makoto Yuki.
Persona 3 the Movie #1: Spring of Birth is being directed by Noriaki Akitaya, who has served as director on the Bakuman anime. Seiji Kishi, who is directing the Devil Survivor 2 anime, is serving as supervisor. Anime studio AIC ASTA is working on the project.
You can watch a short trailer for Persona 3 the Movie #1: Spring of Birth over at its official website, linked to above.