'Sherlock' season 4 spoilers: Tom Hiddleston to join cast as third Holmes' brother?

Sherlock season 3BBC

Tom Hiddleston is reported to join the cast of the fourth season of "Sherlock" as the third Holmes' brother.

Rumors are going around claiming that Tom Hiddleston could play the third Holmes' brother, Sherrinford Holmes. In an interview in Brazil, "Sherlock" co-creator Mark Gatiss joked about Tom joining the cast. "Tom would be wonderful in 'Sherlock. But he only does movies now. What can I say? I'll ask him if you like," Gatiss said.

Tom Hiddleston is known for his role as Loki in Marvel movies of "Thor" and "Avengers". However, he has not commented to these rumors yet. Thus, this remains as a speculation.

Sherlock actor Martin Freeman spilled the beans that BBC favorite TV series "Sherlock" will be doing a Christmas special next year. Reports said that the Christmas special will be based on the story of "The Adventure of the Blue Carbuncle." However, this is not yet confirmed by the company.

Meanwhile, the fourth season of the most-loved series will be back on air in 2016. According to a report from Yahoo, "Sherlock" will be back for a new season, but it will not be big. The report said that the season 4 will only be composed of three episodes. However, there is no exact date yet as to when the series will be back on air.

The primary reason of the delay is the busy working schedule of the main actors of the series as both are working on other projects. Martin Freeman is currently filming the new "Hobbit" film, while Benedict Cumberbatch is shooting "Black Mass" and will be followed by "Blood Mountain".

The filming of the "Sherlock" season 4 will start in January 2015. But the geniuses behind the series were already concocting ideas for the next season. There are no spoilers yet for the fourth season as the season 4 is on the early stages of planning.