Thanks to Harry Potter Fan Zone, we have updates on what Helena Bonham Carter, Robbie Coltrane, Ralph Fiennes, and David Thewlis have been up to.

Helena is in a movie called Sweeny Todd, directed by her husband, Tim Burton. (Read about that HERE). Alan Rickman and Timothy Spall are also in this movie.
Ralph is in a movie called The Reader, with Nicole Kidman. (Read about that HERE)
Robbie is in a show that follows him on a road trip. It is called. (Read more about that HERE)
David Thewlis has written his first novel, The Late Hector Kipling. It will be released in the UK on September 7 (pre-order) and in the US on November 6 (pre-order).