In
the thread about the new picture that showed up today, there's discussion that a barely seen figure behind Indy is the John Hurt character. I agree, because you can also see what appears to be Marion behind Shia and, like it's mentioned in the picture thread, John Hurt refers to the heroes as the "famous five" so it makes sense for the group to be Indy, Mac, Marion, Mutt and the John Hurt character.
What I find interesting is that this barely seen figure, you can only see his legs but he is wearing bedraggled clothes, which also ties in with the sparse information we have about the character. Maybe he has been living in the jungle, guarding the temple?
My theory is that maybe he's an old colleague of Indy who misteriously disappeared many years ago and everybody assumed he was dead (relic hunting, after all, is dangerous business: remember Ravenwood and Forrestall), but in fact he found
exactly what he was looking for and for some reason stayed in the jungle to guard it? Of course that makes him a bit similar to the Crusade in LC...
This would mean that he can't be Ravenwood, because Ravenwood died/disappeared in Nepal. Even if he'd been kidnapped/imprisoned by the Russians, you'd assume they'd at least given him some new clothes from time to time.