This is considered one of the series everyone can't stop talking about. In season 3 finale of "Sherlock," we saw how Sherlock Holmes did what he needs to do in order to protect John and Mary which required action which in result will have a huge consequence for the character.
Upcoming Season Will Get Dark For Holmes
According to "Sherlock" actor Benedict Cumberbatch in a recent interview by Comic Book, he said that he really did a very dark thing last season but he was also beaten. He is in a situation where he met a match that he couldn't beat which puts him in a very difficult position that he couldn't get out
Will Tom Hiddleston Be Part Of The Next Season?
A picture was posted by Mark Gatiss showing Tom Hiddleston together with him and Amanda Abbington, who plays Mary Watson in the series, during this year Comic-Con. The picture had a caption "Blud", were everyone thinks was a hint that Hiddleston could be joining next season as Sherrinford, which is the third Holmes brother.
BBC also has its own way to promote "Sherlock" and "The Night Manager" side by side through a trailer, cutting the clips to Tom Hiddleston every time a brother is referred in the "Sherlock" clip. But the said tweet is now probably deleted.
Three Key Words Meaning
its already a practice of the show to reveal three keywords after every season for the fans to think about. The three keywords revealed by Steven Moffat, Mark Gatiss, and Sue Vertue at the San Diego Comic-Con were actually names, Thatcher, Smith, and Sherrinford.
On an article by Games Radar, the first key word could probably be the famous British Prime Minster Margaret Thatcher. This keyword was also used in Season 2 s The Hounds of Baskerville as a password.
Next, the keyword Smith. On the same article by Game Radar, it is said that this might refer to a character in the original "Sherlock Holmes" novels, Culverton Smith. The last word given is Sherrinfold which is undeniably about the eldest brother of Sherlock and Mycroft, who looked after the family estate leaving the his two brothers free to go into the government and crime-solving businesses.
"Sherlock" season 4 will premiere in 2017.