It's been rumored for quite some time and now it's been made official through Disney's Twitter feed. Walt Disney Pictures has official confirmed that actor Michael Sheen indeed does have a role in Tron: Legacy.
It wasn't officially stated which role Sheen would have in the film, but it was rumored that Sheen was to play a villain that may or may not be human.
We'll certainly keep you posted on any new information that arises about this film or Sheen's role. Tron: Legacy stars Garrett Hedlund, Jeff Bridges, Bruce Boxleitner, Olivia Wilde, Beau Garrett, Michael Sheen and is currently set for a 2010 release.