User blog comment:Damac1214/Back in Black - Call of Duty: Black Ops III teased, reveal trailer coming April 26th/@comment-1916935-20150409175815/@comment-1055346-20150409180151

I think it's just meant to reveal the title. They did the same kind of teaser trailer thing for Ghosts as well. The full, first trailer isn't coming til April 26th.