Similar to the Deadpool leaked trailer footage, it’s only 15 seconds worth, but this leaked footage for X-Men: Apocalypse does reveal Oscar Isaac as the bad guy.
In addition, the logo for the film has also hit the net as well as the logo for Gambit (see below).
“X-Men: Apocalypse” has a May 27, 2016 release directed by Bryan Singer starring Jennifer Lawrence, Michael Fassbender, James McAvoy, Nicholas Hoult, Evan Peters, Ian McKellen, Rose Byrne, Sophie Turner, Tye Sheridan, Alexandra Shipp and Oscar Issac.