Jason Isaacs has confirmed in an interview with ComingSoon that he will indeed return as Lucius Malfoy in the Harry Potter and the Deathly Hallows films.
CS: Are you excited to reprise the role?
Isaacs: I am very excited. Also, the woman who is playing my wife I've been a fan of for a very long time. In fact, one of the great things about going to do "Harry Potter" at all is that a lot of people who are my acting idols I see sitting in make-up chairs beside me. To get to do scenes with Gary Oldman and Richard Harris, Michael Gambon and now Helen McCrory, who I'm a big fan of – it's fabulous.
CS: What was it like to pick up the final "Harry Potter" book when it came out and not know what was in there, especially for you?
Isaacs: I'm not quite strong enough to pick up a book of that weight. I had a couple of people to help me, and a winch. The secret can be out now. Before it came out I wasn't quite sure – there was a point where I wasn't sure I was going to do anymore because there wasn't much for me to do in number five and I wasn't in number six. I met Jo Rowling for the first time at a big awards dinner. I went over and basically fell to my knees and said "Get me out of prison, I beg you." She looked over her shoulder and looked back at me mouthing "You're out. Chapter One." And that was it, that's all I had to know, and I signed up immediately.
