After some false scoops earlier about a post-credits Deadpool scene on Logan, there does appear to be a short teaser for the sequel that plays before the movie.
Slashfilm was able to confirm what the teaser shows:
“The Deadpool 2 teaser isn’t so much a trailer as a scene featuring the Merc with the Mouth. It begins with two men getting into a scuffle after an attempted mugging in an alley. Wade Wilson (Ryan Reyolds) walks by the scene, not suited up as Deadpool, just wearing a hoodie that hides all his scars, listening to the song “Call Me Angel” from the opening credits of the first movie. When he notices the mugging, he’s not having it, and says, “Not in my city!”
Wade runs over to a phone booth to the familiar tones of the Superman theme composed by John Williams. However, the quick change that you’re expecting doesn’t go so smoothly. In fact, we hold on his struggle to change into his Deadpool suit for over a minute until the two men fighting in the alley ends with a gunshot.
Deadpool runs out in heroic slow-motion but finds that there’s only a dead man on the ground that he can’t save anymore. This is where details are a little foggy because one source mentioned that Wade starts running off at the mouth like you’d expect, all while going through the dead man’s groceries before walking out of the alley. Meanwhile, our other source added the detail that Stan Lee provides a cameo as someone who sees Wade walking out of the alley with his face exposed and says, “Hey, aren’t you Ryan Gosling?””
The footage was apparently shot by Deadpool 2 director David Leitch, but doesn’t have any real connection to Logan other than it’ll be playing before the movie as opposed to being a post-credits scene like the original rumors claimed. This scene wasn’t being shown on press screenings or advanced showings of the movie, which is how it was kept secret until now.