If so, this Avengers: Infinity War promotional art might end up on a bunch of different products to promote the movie.
In the meantime, you can check out the promotional artwork for Avengers: Infinity War below and keep an eye out for that trailer.
It is also important to note that there are multiple versions of Cas’ Avengers: Infinity War promotional art, so this might not be the finished version.
This could be intentional to not spoil anything before Infinity War hits theaters, but this is pure speculation at this point.