User blog comment:Damac1214/Back in Black - Call of Duty: Black Ops III teased, reveal trailer coming April 26th/@comment-5290320-20150410041058

Judging from the narration, it looks like they're bringing back the interrogation theme from Black Ops and mixing it with brainwashing a la Room 23 in the TV show Lost which bears a lot of similarities with the Instagram clips. Dr. Salim may be our new antagonist or working in tandem with Raul Menendez (in a timeline where he lives of course). That's just my theory.