January 5, 2012 4:00 PM | Lewie Procter
Ed's dishing out details via twitter if you want to stay up to date. There's currently no release date set for the expansion beyond some time this year: It's done when it's done.
The Binding Of Isaac is the type of game that can really benefit from expansions, because new content can be added relatively seamlessly, so I'm really pleased that Ed's continuing Isaac development. More details on The Wrath Of The Lamb when we have them.