So I haven't seen The Dark Knight Rises yet, as it hasn't come out yet, but I've read a few reviews and I think I know what the big reveal is going to be.
Possible Spoiler Ahead... Maybe?
I think Marian Cotiallard will turn out to be Talia Al-Ghul, daughter of Liam Neeson's character from Batman Begins. The League of Shadows hired Bane to destroy Gotham, linking the final movie back to the first.
Anybody want to place bets?