EXCLUSIVE: 'Sherlock Holmes' Sequel Going To Paris, Switzerland, Maybe 3-D

One of the surprise successes of 2009 was "Sherlock Holmes." Not because it wasn't any good (it was great) or because it featured a cast of unknowns (Robert Downey Jr. and Jude Law anyone?). No, "Sherlock Holmes" was a surprise success, to the tune of $515 million in worldwide ticket sales, because it came out a week after and went up against the record-shattering blockbuster juggernaut that was James Cameron's "Avatar." So it shouldn't come as any surprise to hear Downey, speaking to MTV's Josh Horowitz at the junket for next week's surefire summer hit "Iron Man 2," talking about the coming sequel.

"Yes, I think we'll be abroad," he said, referring to rumblings that Holmes would be leaving London behind for his next adventure. "A bit of Paris, a bit of Switzerland by the end, if I'm not mistaken."

Less certain is which characters will be returning. Holmes and Watson are essential of course, but the first movie featured a number of other key characters who aren't necessarily staples of Arthur Conan Doyle's original tales. "It's hard to say [who is coming back]," Downey said. The biggest question mark is on Holmes' love interest in the first outing, played by Rachel McAdams. "Because Irene Adler only appeared in one of the stories of Doyle's reservoir of activities. But we'll find out quickly."

Downey confirmed that he'll be doing "Gravity" next, with director Alfonso Cuaron, and then following that up with the "Holmes" sequel. Given the competition the first movie faced at the box office with "Avatar," Josh also asked if we might be seeing round two with the great detective in 3-D.

"It's hard to say," Downey said. "Certainly, if you don't do it as an option, then you don't have that option. If the last six months have shown anything, it's that audiences like options, and they will take advantage of them. And you're leaving a bunch of dough on the table if you don't shoot something in 3-D."