That much you know from the trailers, and any more than that oughtn't be said. I'll just add three quick points:
- It's excellent, you should see it as soon as possible.
- Yes, I do have my own personal "guess" as to what the truth actually is, I'll be happy to discuss it in the comments but not here on the main page because spoilers are uncool.
- Amy Adams in a nun's habit makes me think terrible, terrible thoughts.