The Deadpool post-credit scene has leaked online and can be watched below.
It contains a pretty big spoiler.
"Deadpool" has a February 12, 2016 release directed by Tim Miller starring Ryan Reynolds as Deadpool, TJ Miller as Weasel, Gina Carano as Angel Dust, Brianna Hildebrand as Negasonic Teenage Warhead, Morena Baccarin as Copycat and Ed Skrein as Ajax.
Based upon Marvel Comics’ most unconventional anti-hero, DEADPOOL tells the origin story of former Special Forces operative turned mercenary Wade Wilson, who after being subjected to a rogue experiment that leaves him with accelerated healing powers, adopts the alter ego Deadpool. Armed with his new abilities and a dark, twisted sense of humor, Deadpool hunts down the man who nearly destroyed his life.
Deadpool confirms Cable for the sequel.