In a small interview with Entertainment Weekly, the actor who plays Snape in the Potter films reveals he'll begin filming his parts for Half-Blood Prince in early February:Alan Rickman spent a couple of hours having a chat with me about the part and obviously that was nerve wracking; there was me as a nobody and then this famous actor. He's very serious about acting but he likes to joke around. It was really nice and it surprised me - I thought a big star would be different but he was so nice. Everyone is really nice but it's very daunting. You don't realise how many people there are and if you messed up you'd be so embarrassed. It's been a great privilege just to be part of it. It's not just a film, but it's a Harry Potter film.
Thanks to HPANA for the tip!