Tonight during an episode of Wayward Pines, Fox aired a 15-second teaser for the revival of The X-Files in January!
You don’t get much, there’s a shot of the crashed UFO that people spied while they were filming and some people walking towards it. Their clothing hints that is a scene in the past, possibly giving more backstory to the Colonization Mythology. There’s also some shots hinting at what happened to the old X-Files office, and of course we get to see Mulder and Scully again.
Here it is: