I'm not familiar with the actor who's playing Beorn. Just from pictures and clips from YouTube, he doesn't seem very Beorn-like. At least how I pictured him. From what I've gathered, it seems Beorn will be in the first movie, so it makes me wonder how the three movies are going to be split up.
I'll probably be lost through a lot of the second and third movies if there's really going to be a lot of material from The Similarion. It's been about a decade since I tried reading that book, and I couldn't get through it all. I kind of glossed over a lot of the family histories in the LOTR books - I can't remember all that crap - and that seemed to be what The Similarion was all about. Maybe I'll give it another go if I can find it.