This is apparently the first image of Beorn in human (or at least part human form) as he will appear in The Desolation of Smaug.
In the book Tolkien actually keeps it fairly vague as to Beorn’s exact nature and powers. In fact no one actually witnesses him transforming. But I think the movie will be much more on the nose.
It’s interesting that they’re going for such a wild look for him. Actor Mikael Persbrandt is playing Beorn in the movie.