September 1 A new Binding of Isaac DLC has been revealed, which adds the popular fan mod Antibirth to The Binding of Isaac: Rebirth.

It's called The Binding of Isaac: Repentance. The announcement, which came from developer Nicalis, and was also posted from series creator Edmund McMillen, came last night, and refers to something called The Binding of Isaac: Repentance. McMillen provided additional details on Twitter early this morning. Nicalis and McMillen both promise more info at PAX West over the weekend, but all we’ve seen so far is a .gif revealing the game’s title. You can check that out in the tweet towards the bottom of this article. At first, it wasn't clear what exactly McMillen and Nicalis were teasing. A new game was probably high up on the wishlists of a lot of Isaac fans, but Nicalis already have a new title, The Legend of Bum-Bo, on the way. That’ll offer its own take on the Isaac world, so another brand-new title was unlikely at this point. As I suspected, Repentance is a further add-on to Binding of Isaac: Rebirth, which McMillen has been supporting for several years.