Activision appears to be teasing the next installment of Call of Duty in some multiplayer maps of Black Ops 2.

As discovered by YouTuber Drift0r (see video below), two maps in Black Ops 2 – Plaza and Express – feature Snapchat QR codes that add a Call of Duty account to your friends list.

The Call of Duty account currently includes a short video showing the sun shining through forest trees, with a voiceover: "Listen only to the sound of my voice."

It's certainly a Black Ops-style voiceover.

There are now three studios making Call of Duty games, and it’s Treyarch’s turn to release one this year. The studio’s prior entries in the franchise include World at War, 2010’s Black Ops, and 2012’s Black Ops II.

Infinity Ward released Ghosts in 2013, Sledgehammer released Advanced Warfare last year.