This information comes from a Famitsu article...

-In tradition with previous Persona installments, players can once again visit the Velvet Room over the course of the game.
- Persona 3's Elizabeth and Theodore, and Persona 4′s Margaret and Marie gathered to provide support.
- Marie still set to give her unique brand of mouthy assistance, the specifics of which weren't detailed.
- Much like the first two Persona games, every party member will now be able to enter the Velvet Room instead of only the protagonists.
- Layout of the Velvet Room is also set to change once again, with a pair of mysterious locked doors being the most prominent feature.
- Velvet Room's attendants details revolves primarily around Elizabeth and Theodore.
- Elizabeth are two jobs.
- She will have requests that players can go out and fulfill in exchange for rewards.
- Second roll comes in the form of functioning as a nurse that players can visit after making trips to the game's labyrinths.
- Theodore runs the workshop.
-By defeating the Shadows stalking the labyrinths, you'll obtain the raw materials necessary for developing equipment and consumable items.


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Source: Gematsu