We’re clueing for looks in the Sherlock season 4 teaser trailer.

What did we find?

But enough with the larger picture analysis.

Either way, the fact that Moriarty is threaded throughout this entire trailer is a big deal.

The bed looks like it could be empty, but perhaps not…

If it is John simply remembering that time his wife shot his best friend?

Or perhaps he is reminiscing on the birth of his child?

Or, perhaps John himself is ill and is contemplating his own mortality.

This could also possibly hint at the episode involving Culverton Smith, played by Toby Jones.

In Sherlock Holmes canon, Smith first appears in Sir Arthur Conan DoylesThe Adventure Of The Dying Detective.

Could this be a sneak peek at that storyline, come to the BBC programme?

But the significance goes back even further than that.

Moriarty killed a young schoolboy, Carl Powers back in 1989.

Could this pool shot be another reference to Moriarty and his deeply-entwined history with Sherlock?

She was also instrumental in helping Mycroft retrieve Sherlock from exile.

In the teaser, we hear her tell Sherlock: We brought you back to deal with this.

What are you going to do?

We get some good looks at Smith in the teaser trailer.

No, not endless.

Later, we get a cackling voiceover from the series 4 villain.

We doubt Culverton is the man behind the Moriarty vid, but you never know.

If anyone could meet the highSherlockvillain bar set by Andrew Scott, its Toby Jones.

Were going to get out of London

Whos up for a jaunt in the country?

Could this be part of the Moriarty storyline?

Or is it something else altogether?

Is he aiming at Lestrade or is Lestrade trying to keep him from shooting someone else?

There, I said it!

What is going on here that makes the usually cordial Mrs. Hudson so disgusted with Mycroft?

No doubt her hackles are raised in defence of Sherlock, who she sees as a son.

Has Mycroft said or done something terrible to his younger brother?

Hopefully, this time, she shoots someoneotherthan Sherlock?

The big question is: is this a flashback or does it happen in present-day?

Our moneys on the former (no wedding ring at least).

There seems to be a lot more action (and guns)

Car chases!

Hand-to-hand combat!Sherlockseason 4 seems to have it all.

At one point, we even see Sherlock trying to fight someone off in a random kitchen.

Does Sherlocks ultimate showdown with Moriarty happen at the beach?

Could this be a flashback to Moriartys pre-death machinations?

Is this in Sherlocks mind palace or is it happening in real life?

Is it a reference to Sherlocks continuing struggle with drug addiction?

Is it all related to that shot of John standing over a hospital bed?

Sherlock looks scared

Whatevers going on in that hospital scene, it has Sherlock thoroughly freaked out.

If anything is going to frighten Sherlock, it might very well be a newborn.

Another, less lovely and therefore probably more probable theory?

Culverton Smith has sprung an infectious disease on Sherlock.

The canon baddie is known for using rare diseases as a murder weapon…