Update: The Behemoth has confirmed that the new Castle Crashers DLC will cost 160 MS Points ($2.00/£1.36/€1.86) and will be available on August 26.
Original Story: The Behemoth has announced that the upcoming DLC for Castle Crahers is called Necromantic.
It will add the chainsaw weapon and provides access to two new characters which are the Cult Minion and the Necromancer. A Dragonhead animal orb and the NG Skull Mace are also to be added.
Pricing and a date were promised "soon" by the developers.
More through the official site.