From the video’s description:
Collect the right pieces as you make your way through Tranzit and you might have a chance to put them to good use.
Shotguns are classic, and rifles are powerful, but neither can compare with the cover offered by the Zombie Shield.
Black Ops 2 will feature a highly focused Zombie mode for players. A whole city is under lock down and infested with the undead. Players will take the Tranzit to travel between areas and take out the horde. Along the way you’ll come across constructable items. You can use such items to make yourself a home-made weapon.
Call of Duty: Black Ops 2 will release for the PS3, Xbox 360 and PC on November 13.