Four types of Panty have been added: Camouflage Panty, Kunoichi, Succubus and Princess.
As a player character you'll be able to use them in the Story, Arcade, Multiplayer, Local, Online modes.

Camouflage Panty (CV Maruyama Miki)
Kunoichi (CV Kaho Narumi)
Succubus (CV Keichou Yuka)
Princess (CV Miyazaki Tamako)

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