Someone posted this video : http://www.youtube.com/watch?v=K9hJMxw126A : to show a distinct feature, such as talking to a whiterun guard.

I know it sounds silly but pay attention to the youtube comments. . people are saying Todd has confirmed werewolves, there will be distinct features, that a certain requirement must be met etc.
I'm keeping a close eye on all of them and PMing anyone for source, info and links.