The Special Gestures DLC will be removed from the Steam store on September 14, 4pm PDT. Don't forget to download it!
It includes a gesture for each Devil (F1) and two gestures for each Gambler (F4, F5). Once you had downloaded the DLC, you will have the access to these gestures forever. After this timeframe, this limited DLC will not be acquirable on the Steam store or in the game.