Earlier, Today someone asked Jason Schreier about Call of Duty 2020 and said “You mentioned the fact that Call of Duty has released annually since 2005. With Treyarch having a shortened development cycle because of the Sledgehammer/Raven issues, do you think it’s possible we don’t get a new release this year?” Jason replied with “As of right now it’s still planned for fall, but nobody knows what’s going to happen in the coming months!” Then after that, someone asked Jason “Would you happen to know any information about this year’s Call of Duty title? It’s leaked to be a Black Ops reboot but I’m just curious as to what you’ve heard” Jason said, “I don’t think it’s a reboot” after that someone asked him “What do you think then? Vietnam title?” he replied with “Yeah Cold War/Vietnam I believe”.

Source

The Gaming Revolution also posted a video about it.