Thousands of fans are still not over yet with the 1895 Victorian Era special of Sherlock titled as 'The Abominable Bride'. The showrunners have been giving hints of possible major deaths in the upcoming season according to their interviews.
Steven Moffat left numerous clues in the last episode which will make you think twice, according to Crossmap. He said that he didn't choose the number '1895' for nothing. It has something to do with the plot story of the upcoming season.
1895 was the year Sherlock got famous and killed at the same time by the author of the book Sir Arthur Conan Doyle. The number 1895 was also shown in Sherlock Season 2. It was the numbers of views in Watson's blog. If you didn't notice, you might want to re-watch all of the episodes and search for other clues.
Showrunners Mark Gatiss and Steven Moffat have always been describing Season 4 as "dark" "frightening" "emotional upheaval". Fans have also been speculating the possible death of John Watson's wife Mary; because it was mentioned in the book of Sir Arthur Conan Doyle that they had a short-lived marriage and Mary might die due to child birth.
"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.
In one of the interviews of Martin Freeman, Freeman mentioned that the producers of Sherlock will try to stay loyal to Sir Arthur Conan Doyle's book. "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." Freeman said.