'Sherlock Holmes 3' on the Way?

By
As the Sherlock Holmes sequel heads into theaters on December 16, could the movie franchise be heading for a trilogy?
In Sherlock Holmes: A Game of Shadows, Holmes (Robert Downey Jr.) and Watson (Jude Law) reunite to solve a murder and battle Holmes' greatest adversary, Professor Moriarty (Mad Men star Jared Harris), with the help of a wily gypsy fortune teller (The Girl with the Dragon Tattoo trilogy star Noomi Rapace).
Watch the clip to see what the movie's key players had to say about a possible third installment.