From what I've read on official Disney material lately about dining, and a post on another site here, Disney is no longer doing "Advance Dining Reservations." (ADRs) Maybe because someone there realized that ALL RESERVATIONS FOR ANYTHING ARE IN ADVANCE. Therefore, it's "reservations' now. As an English wonk, I couldn't be happier.
(For us old timers, we can still use PS.)
(For us old timers, we can still use PS.)