They really haven't said much about Ken Watanabe's role in the film, although some claim he might play a role akin to Daisuke Serizama from the original 1954 film.
I wouldn't be surprised if that was it. They did have clues on their comic con display site that spelt our the name Serizawa.
Anyone got an link to the trailer? Why are they taking it down so much? It's like these fools don't want their movie to have publicity.
Sorry, no luck at the moment. The actual trailer is leaked, so that's probably why it's being taken down. But who's to say that the leak isn't their doing to begin with. Especially since it has footage that wasn't described at either Comic Cons.