I guess when Disney announced that Michael Sheen would have a role in Tron Legacy nobody bothered to listen. To remind people of the casting announcement, Disney shot off a small update on Twitter. And I do mean small, as Twitter only allows 140 characters.
Michael Sheen for Tron Legacy
@MSheenOnline Yes, Michael Sheen will have a role in Tron Legacy!
What I'm still unsure about is what exact role Michael Sheen might be playing. The film stars Jeff Bridges, who reprises his role as Kevin Flynn, and Garrett Hedlund, who plays Kevin's son in the film.
Tron: Legacy is expected to open to theaters some time in 2010.