'Sherlock' Season 4 Air Date, Premiere & Trailer: Mark Gatiss Teases 'Life-Changing' Events, Unexpected Things Happen to Sherlock & John?

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With the "Sherlock" Victorian Special looming near, show creator Mark Gatiss teases fans that there will be "life-changing events for regulars." What will happen to Sherlock and John in season 4?

In season 3, we learned that Sherlock's arch nemesis isn't dead. Moriarty (played by Andrew Scott) supposedly died in season 2 and things are looking pretty glum and exciting for season 4. "Sherlock" creator, Mark Gatiss, adds fuel to the fire by teasing fans that the upcoming season which will be filmed in the spring of 2016 will be "life-changing" for its regulars.

"Well, it's some more adventures. Ha ha!" says Gatiss to Entertainment Weekly when asked what fans can expect in season 4 of the show. "All I can say is, this is a major, life-changing series for the regulars. The repercussions of Moriarty's apparent return are far-reaching. It's very big stuff."

Co-creator Steven Moffat added that there was a clue in season 3 that will lead to the events in season 4 and it has a lot do with consequences.

"You can sort of see that in the way series 3 went. It's great that he's back and John's [Martin Freeman] got a wife and Sherlock [Benedict Cumberbatch] likes her and isn't it adorable, and then it all goes to hell. Remember where we left them," Moffat said via EW.

He adds that fans will definitely clamor for season 5 after season 4 because it will be a "tougher series." Moffat explains when distinguishing season 4 from the past seasons is that it is about consequences. Season 1 was about the friendship of Holmes and Watson, season 2 was the "formative stages" of their bond, season 3 is about the "golden days" of the two alongside Watson's new wife.

Crossmap points out that in the original version by Sir Arthur Conan Doyle, Watson and his bride Mary (played by Amanda Abbington) only had a short marriage. When Freeman was asked, he said:

"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," reports the Independent.

Gatiss adds that not all things that were canon in the original book will happen in the series because there will be a lot of changes.

"Sherlock: The Abominable Bride" will air on Jan. 1, 2016, on PBS and BBC. "Sherlock" season 4 is due to be filmed next year and will air later next year.