I'm a huge fan of the book and I have been looking forward to this movie more than any other movie in...let's say two years. But, how much a fan I ever am of Ewan Mcgregor (absolutely love him), I had hoped for a pure Italian actor to play the part of the Camerlengo.
I do have faith in Mcgregor (I mean, there's a reason why he was cast), but he's just not THE ONE Camerlengo for me. The character is so powerful and enigmatic that I have a hard time picturing beautiful singing and Star Wars-known Mcgregor in the part. However, I AM excited to see the movie. Can't wait another year!