The premiere date of "Sherlock" 3 is still shrouded in mystery, but there are already talks of "Sherlock" Season 4 and "Sherlock" Season 5. Benedict Cumberbatch, who plays the titular role of Sherlock, and Martin Freeman, who potrays Dr Watson, have shown interest in doing a couple of more seasons of "Sherlock" despite their busy Hollywood schedule.

Cumberbatch had indicated that they have agreed on doing two more series. "All I know at the moment is I'm doing these three [the episodes of "Sherlock 3"] and another three," the Bristish actor had said as quoted by The Global Dispatch. Freeman had said at an event that the season four of "Sherlock" is in the pipeline.

Steven Moffat responded to Cumberbatch and Freeman's comments on the new, unannounced seasons, with some British humour.

"We had to inform the BBC that Martin and Benedict had commissioned a new series. They signed themselves up. They both announced that they were carrying on -- so that's good," Moffat said as quoted by Radio Times.

The hugely popular BBC series "Sherlock" is based on Sir Arthur Connan Doyle's "Sherlock Holmes." There are speculations that "Sherlock" Season 3 will premiere sometime in January, 2014. BBC might give millions of "Sherlock" fans a surprise gift in the form of a new episode on October 31, 2013. The October 31 date, however, seems highly unlikely as we are well past mid-October.

The first episode of "Sherlock" Season 3 is The Empty Hearse', written by Mark Gatiss and directed by Jeremy Lovering. It is loosely based on the original short story by Sir Doyle, "The Adventure of the Empty House." Sherlock will appear in front of Watson at the Baker Street, revealing to him and the viewers how he faked his death. Watson will be happy seeing his friend back but will hold a grudge against him. Watson is also expected to get married in the new season, probably in the second episode of "Sherlock" 3.

Charles Augustus Magnussen is the new villain, portrayed by Lars Mikkelsen.