Four types of Panty have been added: Gingham Check Panty, Sukeban, Leather Panty and Witch.
As a player character you'll be able to use them in the Story, Arcade, Multiplayer, Local and Online modes.

Gingham Check Panty (CV Hoshitani Mio)
Sukeban (CV Tazawa Masumi)
Leather Panty (CV Kawamura Rie)
Witch (CV Sakuragi Tsugumi)

More details on the official game page of DokiDoki Pants set A ...