BEHOLD, THE SHERLOCK SERIES THREE PREVIEW TRAILER IN ALL ITS GLORY.
View this video on YouTube
Truth be told, the trailer was a little anticlimactic, BUT WHO CARES, BECAUSE WHEN YOU'RE DYING OF THIRST IN THE DESERT, EVEN A LITTLE BIT OF WATER HELPS, RIGHT?
The trailer opens with a shot of Mrs. Hudson.
We see Lestrade rocking a buzzcut.
We see Mycroft.
IMPORTANT: We see Molly and SHERLOCK'S REFLECTION IN THE MIRROR BEHIND HER.
ALSO IMPORTANT: John has a moustache.

The trailer ends with what appears to be the moment before Sherlock and John's reunion.
BBC One hinted that a surprise would be coming at the end of a repeat of "The Reichenbach Fall."
Don’t miss the repeat of #TheReichenbachFall tonight at 8:30pm. Our advice - keep watching to the very end! #Sherlock
BBC One
@BBCOne
Don’t miss the repeat of #TheReichenbachFall tonight at 8:30pm. Our advice - keep watching to the very end! #Sherlock
Which is good because Sherlock fans deserve to be rewarded for undergoing that kind of emotional trauma again.