Previously announced to come out on the 28th this month, more screens and details regarding the DLC have been released.
The episode setting is in the casino Serendepity, and Sazh is said to be in search of his missing son, Dajh, for yet to be known reasons. Two new table games are to be added into the the casino’s minigames as we know of, one being Chrono Bind and the newly revealed Xanadu Poker (these are assumed to be the Japanese terms since the casino is called Xanadu in the Japanese game). Sazh will also encounter the travelling merchant Chocolina and will be asked by her to find some missing chocobos. More about their connection to each other will be revealed once the quest is completed.
Source: Andriasang