Just like the title says, these are only rumors right now. However, often so-called ‘rumors’ turn out to be the real deal. So, for now we know that IMDB has listed 2 new actors cast in Breaking Dawn. Twilight Examiner Amanda Bell weighs in:
The first is Drew Roy, who the site notes is “rumored” to play “Nahuel.” That character, if you can’t quite place the name, is the one which [*spoiler alert*] which comes in at the very end as proof that “Renesmee” wasn’t the only one of her kind in the world and that she would grow up to normal size like the mortal that she is. As the Twilight Saga Wiki points out, ”Nahuel is described as an extremely handsome young latin man with rich dark brown skin, eyes the color of warm teak, and extremely attractive features. He wears his black hair in braid past his shoulders.” Drew Roy is a film and TV veteran of Hannah Montana, Greek, and others.
The second is Guri Weinberg, who IMDb.com has listed as “Stefan.” “Stefan” was one of the two Romanian vampires who had a particular distaste for the “Volturi” and hoped to see them fall once and for all. Per Twilight Wiki, “He has black hair and dresses in all black.” Guri Weinberg has been in films like Munich and You Don’t Mess With The Zohan.
Check out Amanda’s entire article HERE