Over at the Xentax forums, user luxox18 posted a datamine of P.T. that was completed just a few days ago, revealing models and enemies that we never see in the game:
The best part of this discovery, however, is that players were able to port the models contained within P.T.—meaning, players can now use the in-game Norman Reedus and Lisa however they see fit. Lakitouille in particular took the Lisa model and put it into Metal Gear Solid V’s Quiet, as well as replaced Big Boss with Reedus, resulting in this incredible rain scene:
I could barely breathe watching this. EVEN THE FETUS MAKES AN APPEARANCE. OH MY GOD.
And with this, P.T. likely gives us its final hurrah. Thanks for everything, you horrifying buddy.