Progress on The Binding of Isaac: Repentance has is still ongoing. The upcoming DLC to The Binding of Isaac: Rebirth had been announced years ago, and there have been weekly blog posts from the dev team showcasing the DLC’s various additions. Repentance’s main addition is content from the Antibirth mod, but other stuff is also being included.
Currently, it is still on track to release on March 31st for the PC via Steam. As for consoles, the last we heard is that it as releasing on console platforms “later”. Well, there has just been an update that says that it will be releasing on the PlayStation 5, PlayStation 4, and Nintendo Switch in Q3 2021. You can also pre-order physical editions of the PlayStation 5 and Switch versions on the official Nicalis Store for $59.99.