Holy shit, this sounds so awesome in concept. Creepy paranormal occult experiments by the Nazis in big-screen form? There won't have been anything quite like it, and I hope they handle it well. With two protagonists, they have a chance to do something really special, and I hope they don't cheese it up with referential jabs and pandering.
Do what Return to Castle Wolfenstein was trying to do: Actually make a really creepy action-horror movie about two agents pressed for their lives in a crazy world of paranormal experimentation.