Without spoiling too much the new chapter in Persona 3: FES has the heroes stuck in a time loop forever trapping them in March 31st. Aigis becomes the protagonist in the Answer (this was called Episode Aigis in the Japanese version). Metis is the primary new character and you can see her Persona in the battle clip below.
The next two movies have some light plot details, which may contain minor spoilers if you haven’t played Persona 3. Just a warning! However, if you’re interested in seeing the pretense for the Answer, check these videos out.