Cast and Crew of Sherlock Season 4 has already started filiming for the upcoming season. There are rumors that we might see, Sherrinford Holmes in Sherlock Season 4. Could it be played by Tom Hiddleston?

Surely there are tons of speculations coming from Sherlock fans for the upcoming Sherlock 4, there's the fact that we saw Moriarty on the TV screen before the ending of Sherlock Season 3, it normal for us to assume that Moriarty came back to life although it is quite confusing since Sherlock saw Moriarty kill himself. Also Steven Moffat (Creator of Sherlock) actually denied this rumor in an interview claiming that Moriarty is certainly dead, however Steven Moffat might just want to surprise us.

One thing that is confirmed for the upcoming Sherlock 4 is the fact that Benedict Cumberbatch (Sherlock) and Martin Freeman (Dr. Watson) are indeed going back in time, to be exact; the Victorian Era, however this is just for the Holiday Special, which has nothing to do with the rest of the season according to Mark Gatiss in his interview with Entertainment Weekly, Steven Moffat added, "We wouldn't have done the story we're doing, and the way we're doing it, if we didn't have this special. It's not part of the run of three episodes."

We all know that there are only 3 episodes per season for Sherlock and those 3 episodes are only once every two years. So we were expecting for Sherlock 4 to be released early 2015, however, most recently Steven Moffat announced that 'Sherlock Holmes Season 4' will start filming mid-year next year; which makes the release date for 'Sherlock Holmes Season 4', early 2017.

Remember when Mycroft was discussing with some politicians about the punishment to be served for Sherlock back in season 3? And do you remember his line when they doubted that Mycroft might be biased because Sherlock is his brother? Mycroft said, "You know what happened with the other one." Most ignored this line, probably too cryptic, however it simply meant there's another one in the Holmes family, a brother or a sister of Sherlock and Mycroft.

Since this scene was shown during the last episode of season 3, can we expect another Holmes sibling to make an appearance in Sherlock Season 4? Apparently so, some fans are assuming that the other 'brother' is going to be played by Tom Hiddleston. Oh. The. Grandeur! Tom Hiddleston and Benedict Cumberbatch in one series, however this is still a rumor and there's no official word on this.

There are also the talks of Mary's death due to childbirth, when it comes this one; the cast seems to be saying different things. Martin Freeman is saying that Mary might actually die this season, but Mark Gatiss is saying that this isn't the case.

Sherlock Season 4 is said to premiere early 2017.