According to The Hollywood Reporter and various insider trades, Eddie Redmayne is the studio favorite to star in this new trilogy set in the Potter universe. The Oscar-winning star of The Theory of Everything will reportedly not commit until he reads Rowling's finished script for the film. There is no offer yet, but with director David Yates back on board, I can't imagine Redmayne turning this one down. He doesn't have anything on his plate besides Tom Hooper's The Danish Girl, an early Oscar front-runner for next year, so I think we'll definitely hearing more about Redmayne and Potter in the near future. I personally like Redmayne and think that he'd be great in a Potter spin-off. Even though he's the most Oscar-baity actor in Hollywood, that doesn't take away from the fact that he is very good at what he does.
I'm also excited by the potential of this new franchise. While Warner Bros. is definitely treading into Hobbit territory here, there's a lot of potential for something fresh and unique with this new series. Fantastic Beasts and Where to Find Them is currently set for release on November 18, 2016.