It was called Afterbirth because it took place after Isaac's birth. Why'd they have to make this all so complicated? Repentance is incredible. Buy it if you haven't already store.steampowered.com/app/14...
Trust me, it'll be worth the wait. Repentance is an absolute game changer with all of the new features, polish and tweaks it brings that massively improve the experience. 10/10 DLC, no doubt Four Souls is a pretty great way to pass the time until then tho. That game is rad :)