Gun Game is heading back to the Black Ops series. David Vonderhaar confirmed is interview:
“The game does have Gun Game, there is some one shot stuff going on in Gun Game. But as you would expect from a Treyarch Call of Duty Multiplayer title, a complete custom game set with being able to share and save those variant game modes. What we like is the idea that people can take the game, take the game engine, take the game rules, modify them to suit and make them accessible to all your friends. We are going to take the best of those ideas and mess around with them in the “Bonus” category of playlists.
So never say never. One shot game mode specifically isn’t a particular type of mode but Gun Game is our first entry there and we will see what you guys do and go from there.”
Source: EB Games Twitter