Besides a new picture of Sherlock Holmes 2 we also have a plot synopsis thanks to the Los Angeles Times:
Plot of Sherlock Holmes 2:
“Set in 1891 — a year after the last film’s events — the sequel shows Holmes (Robert Downey Jr) continuing his pursuit of Professor Moriarty (played by Jared Harris), who, if the investigator’s instincts are correct, might be the world’s first supervillain. Watson (Jude Law), meanwhile, is still trying to be a good partner to his love, Mary Morstan (Kelly Reilly), while keeping Sherlock alive.”
The film is directed by Guy Ritchie. It will hit theaters on December 16, 2011.