I was just watching a film called "Diary of the dead" by George Romero (The penis within Call of the Dead) and It seemed an awfully lot like the zombie trailer..
The film had several characters including:
A redneck girl (Like in the trailer)
A Geek (Like in the trailer)
A Old guy/professor (Like in the trailer)
The other character wasn't revealed in the trailer but there are plenty of other characters.
They are also travelling around on a bus, using it as a weapon to run over zombies and are also firing weapons off the bus.. (Like in the trailer)
The geek also rises up to be a hero in some cases, the same information was also released about the geek within the game..
Could this be where Treyarch have gotten there inspiration from and could the film also lead to more clues and reveal things about the game?!
Im not saying this is fact, It was just a thought!xo