Portugese retailer FNAC listed Call of Duty: Black Ops 2 on its website earlier today, giving creedance to last month's rumors about the game's existence. FNAC's home page listing, which still appears for a second before being replaced with another image, says the game will be in stores on November 12th.
Amazon France had been taking pre-orders for Black Ops 2 for a very short time in February before being changed to a less conspicuous title, "Call of Duty 9". Similarly, a Treyarch employee had listed Black Ops 2 on his resume, though that listing has since been taken down.
As of now neither Activision or Treyarch has publicly confirmed or denied the existence of Black Ops 2.