User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-7495548-20130802165208/@comment-12293947-20130802220415

Actually, if you use the game modes, it is TNEDD. (I don't care what people say, I firmly believe Die Rise/MotD/Buried are gamemodes. Nuketown could go both ways, I guess.)

Anyway, the whole TEDDY thing was interesting when it was first thought up like five months ago, but it is annoying as hell now.