ComingSoon.net is reporting that the sequel to the 2009 Sherlock Holmes film starring Robert Downey Jr. will be called Sherlock Holmes: A Game of Shadows, and will feature Stephen Fry as Sherlock’s brother, Mycroft Holmes. Downey returns as the title character, as does Jude Law for Dr. Watson. Professor Moriarty will be the primary villain.
The film is currently scheduled for a theatrical release on December 16th of this year. It’s IMDB page can be found here.