Edmund McMillen has announced that the Binding of Isaac: Repentance is actually the final piece of downloadable content for the Binding of Isaac games. The DLC includes the Antibirth mod + and PlayStation Lifestyle also reports that it contains a new soundtrack, new cutscenes, and new story bits amongst other things. The full details will presumably be announced at a later date.
Binding Of Isaac: Repentance Is The Final DLC For Isaac

Is it DLC only? Or is a physical release with it coming also?
This is like, the 3rd time the final DLC has been released. Not complaining though, I have 3,000,000% on Switch Afterbirth+ and 111% on 3DS Rebirth.
The mod is just called Antibirth. Not “Antibirth mod +”