It looks like the Snapchat teaser QR code in Black Ops 2 this week turned out to indeed be a hint at Call of Duty: Black Ops 3 according to a new teaser trailer published by Activision.
There are a number of hints in the new #backinblack trailer on the Call of Duty YouTube channel that give us some clues to the game being Black Ops 3. In the trailer, we hear a voice say “The numbers, Mason,” which is known for being a phrase said in Black Ops. Also, the logo of Black Ops II turns into a “III” towards the end of the trailer.
The end of the trailer says we should expect a world reveal to take place on April 26, 2015.