'Sherlock' Season 4 is slated to air in 2016, and a Christmas special on December 2015.
According to Hollywood Reporter, Steven Moffat has revealed that the special will be based on the "The Adventure of the Blue Carbuncle," one of the 56 short stories written by Sir Arthur Conan Doyle for his Sherlock Holmes series.
but Mark Gatiss hinted that Sherlock fans will 'expect a tragedy."
In an interview with Radio Times Gatiss, who also plays Mycroft Holmes and co-creator of Sherlock tv series brought some bad news. He said, "You can always expect tragedy as well as adventure, that's just how it goes."
Rumors speculate that this may be the death of Mary Watson that originally happenned in Arthur Conan Doyle 's story.
Meanwhile, Freeman told UK's Telegraph, "While we play fast and loose with the original stories, we generally follow the trajectory of what Conan Doyle did. So [Watson] gets married, and then Mary dies - so at some point presumably she'll die."
But Mark Gatiss didn't confirmed who'll die in the upcoming season "Just because it's in the stories doesn't mean it'll happen in the series because there's an awful lot of changes and an awful lot of places to go and things to do." He added, "It should be clear by now that while, of course, Doyle is our absolute god, we have gone quite a long way away as well... so there are lots of surprises to come."
Another rumor claims that Mrs. Hudson will die in the next season.
In addition, Moffat told Entertainment Weekly that the upcoming season will be darker and devastating.
"We have a plan to top it," he said.
"And I do think our plan is devastating. We've practically reduced our cast to tears telling them the plan ... we're probably more excited that we've ever been about Sherlock."
We'll keep you updated for more 'Sherlock' Season 4 news. Stay tuned.
