The cat is out of bag about the fate of Sherlock Holmes' famous villain.

The popular BBC detective series co-creators Steven Moffat and Mark Gatiss spoke in a Royal Television Society's event last week and confirmed that Jim Moriarty is set to return in Season 4, as reported by Hollywood Reporter.

The so-called "consulting criminal" played by Andrew Scott shot himself to death in Episode 3 of the series' Season 2.

It is unknown though what theory are they going to use to disclaim his alleged suicide.

Gatiss and Moffat admitted that the "did you miss me" scene in Season 3 was not a last minute addition as they "had long planned the twist."

The producers also revealed everything is already figured out about "what will happen in the next season," though these plans will "get more detailed" as the production deadline draws closer, Hollywood Reporter said.

The future of the show lies on the availability of the lead characters as both Star Trek: Into Darkness star Benedict Cumberbatch and The Hobbit actor Martin Freeman are busy with other film projects.

"There was suddenly a kind of outraged response that it might not be back until 2016 but that's precisely how long it always is. It's always two years! But we'd like to return soon, of course," Mark Gatiss, who also plays Sherlock's old brother Mycroft Holmes, told Metro.

But is the series in for a long haul?

"The idea of growing older with it would be great. But it is hard to get everyone back together, because they have become extremely famous -- except for us," he added

What are the other changes to expect with the new season, everyone asks.

Gatiss disclosed that with each season is all "about keeping it new," particularly new characters and plot lines.

Another surprising detail is the co-writer's push for "Sherlock's gradual humanization."

Though Gatiss and Moffat did not elaborate further about what this twist mean, we are confident that 2016 will be a long but exciting wait.