Last week, we got our first look at Watson's baby in new photos from Sherlock Season 4, which also featured Martin Freeman as the proud father, Amanda Abbington as the doting mother, and Benedict Cumberbatch as the seemingly-perplexed Sherlock Holmes. As fans count down the days until the January 1 premiere on the BBC and PBS, a teaser trailer has arrived, which features the tagline, "It's not a game anymore." We also see both Holmes and Watson in quite the peculiar predicament.

The show's official Twitter released this trailer, which shows a seemingly-calm Holmes and Watson sitting across from each other, in a room which is half-full of water. It's never stated why this room is full of water, or why both Holmes and Watson are just hanging out here, but perhaps we'll learn more when subsequent trailers arrive as we get closer to the January 1 premiere. It's possible that the new villain may have something to do with this submerged room.

The photos released last week also gave us a glimpse at the new villain, Culverton Jones, played by Toby Jones. This character was featured in the Arthur Conan Doyle story "The Adventure Of The Dying Detective." Episode two will be directed by Nick Hurran, who was Emmy-nominated for Outstanding Directing for a Miniseries for "His Last Vow", a Sherlock Season 3 episode. The first episode this season has been confirmed to be called The Six Thatchers.

Related: Sherlock Season 4 Trailer Promises Dark Days for Benedict Cumberbatch

There are already theories that the title could be a reference to the Sir Arthur Conan Doyle story The Adventure of the Six Napoleons, which was published in 1904, where the duo investigated a number of crimes related to broken statues. It's possible this new story could swap out the French military leader for the Great Britain Prime Minister Margaret Thatcher, but no official plot details have been given for this episode yet. With the premiere date getting closer and closer, hopefully new plot details will surface soon.

Promising laughter, tears, shocks, surprises and extraordinary cases, Season four will begin with the nation's favorite detective, the mercurial Sherlock Holmes, back once more on British soil, as Doctor Watson and his wife, Mary, prepare for their biggest ever challenge - becoming parents for the first time. This new season will consist of three 90-minute episodes. The first of the three feature-length episodes in Sherlock Season 4 will be directed by Rachel Talalay, who has worked as a director, producer, and professor in film and television for more than 25 years, having previously directed Doctor Who, The Flash and The Wind in the Willows.

Sherlock is written and created by Steven Moffat and Mark Gatiss, and inspired by the works of Sir Arthur Conan Doyle. Sherlock is produced by Sue Vertue and the executive producers are Beryl Vertue, Mark Gatiss and Steven Moffat for Hartswood Films, Bethan Jones for BBC Cymru Wales and Rebecca Eaton for Masterpiece. It is distributed internationally by BBC Worldwide. Take a look at the new trailer Sherlock Season 4, as we get closer to the New Year's Day premiere.