Blog Hogwarts did a small interview with Death Eater actor Lord Johnpaul Castrianni., and The Portkey translated it.  We find out that there are a few characters/actors that WB hasn’t announced officially yet!

BlogHogwarts: Have you read any of the Harry Potter books before you obtained the role?
Lord Johnpaul Castrianni: I am a very big fan, if not the greatest fan of the Harry Potter books, so yes, I could say I have read the books before.

BH: Have you already shot scenes of Half-Blood Prince? In which scenes are you present?
LJC: My scenes were filmed several months ago and I finished in February (2008). I was in the scenes regarding Alan Rickman, Dan, Michael (Dumbledore) Tom (Malfoy) and several other cast who I believe have not been officially published by Warner Brothers yet, so unfortunately I cannot comment on that yet.

BH: How do you feel about being in a Harry Potter film?
LJC: For me, the fact I was chosen to be in Harry Potter was the greatest feeling in the world, almost as great as being offered a job at Walt Disney World in Florida where i currently am living for the year until 2009. Then who knows… what i may be required for in Deathly Hallows?