Sorry, Logan does not have an end credits scene. That's just a fact. But that doesn't mean Fox doesn't want to give something for fans for freak out about, and now we know what it is.
This would spoil a pretty big surprise that will reportedly play with screenings of Logan so, if you want to be surprised, leave now. Don't worry, we won't spoil Logan itself, just the extra footage that will be attached.
You can read a full description of it on their site but basically, it features Ryan Reynolds walking along the street, seeing a crime, changing in a phone booth and then trying to stop it. It then ends with the words "Deadpool... coming... not soon enough."
Word is the footage was directed by Deadpool 2 director David Leitch but there's no word if it will make it online. If it does, you'll find it here.