The retired flavors include: Caramel Praline Cheesecake, Campfire S'mores, Apple Pie a La Mode, Superfudge Truffle, and French Vanilla which has been a staple since 1945.
There's no word yet on what the new Baskin Robbins flavors will be. And as for the old ones, you better get them while you can. They'll only be available as long as supplies last.