That's Treyarch's game designer David Vonderhaar tweeting his idea for where the Zombies storyline should go, giving players the ability to choose the fate of the "New" crew, Abigail "Misty" Briarton, Samuel J. Stuhlinger, Marlton Johnson, and Russman. After posting this tweet, he re-tweeted 3 people who claimed they just want to see the "Original" crew, Tank Dempsey, Nikolai Belinski, Takeo Masaki and at this point in time Samantha Maxis in Edward Richtofen's body, back as playable characters. This seems to imply that we will be saying good bye to the new crew and hello to the old crew fairly soon.
It should be noted, however, that DV mentions that this is just an idea and is 100% unsanctioned. This, combined with the fact that Vonderhaar is not a part of the core zombies team, might mean this all just a fun idea and nothing will come of it.