This is a teaser trailer for a cool-looking fan film called Deathstroke: Arkham Assassin. The short looks like it was really well made, and it's sure to entertain the fans.
Taking place prior to the events in "Batman: Arkham Origins"… A bounty is placed on Batman by crime lord Black Mask, drawing eight of the world's greatest assassins to Gotham City on Christmas Eve... The most formidable of which is Deathstroke, who provides a bloody and violent demonstration of his skills for Black Mask.
The full short will be released next week. We'll make sure to get it on the site for you when it's available.