Shadow&Act. It's very well real as copies of the script have made it's rounds to various studios looking for international distribution. I wouldn't be surprised to see it hit online within a few weeks. If true this film is indeed A Southern and will feature a freed slave bounty hunter (Django) as the film's hero. Christoph's role seems to be revealed as well as he'll be playing a German bounty hunter who trains/teams-up with Django. It's likely that his part is inspired by German actor Klaus Kinski's Loco in the The Great Silence yet another Sergio Corbucci film.
“Django is a freed slave, who, under the tutelage of a German bounty hunter (played by Christoph Waltz) becomes a bad-ass bounty hunter himself, and after assisting Waltz in taking down some bad guys for profit, is helped by Waltz in tracking down his slave wife and liberating her from an evil plantation owner.”