It's practically customary at this point for a shorter teaser to precede the release of a full trailer (and yes, a trailer is itself a teaser for an actual movie). Thus this 15-second promotion for Marvel Studios' new "Avengers: Age of Ultron" trailer, which was released Monday via Facebook.

The actual trailer is set to debut tonight, Jan. 12, during the College Football Playoff National Championship game on ESPN (a network owned, like Marvel, by Disney). The game starts at 8:30 p.m. Eastern, but exactly at what point the trailer will debut hasn't yet been revealed. Here's the trailer, featuring fleeting glimpses of the upcoming superhero-centric sequel.

Post by Avengers.

"Avengers: Age of Ultron," written and directed by Joss Whedon, is slated for release on May 1.