User blog comment:Ebony2k16/Season 3 Sneak Peak/@comment-25176701-20160109044329/@comment-27404483-20160109044832

I noticed that too, it was deleted recently. I may have been a leak because it shows a clip of Lexa defeating Roan (kicking him off a cliff) which I thought was strange because I thought that might have been something they didn't want to show to keep the suspence.

It was on Vimeo over their youtube channel which also indicates it may have been a leak.