Magma takes place in a modern Japanese village that has a live volcano nearby Encore takes place in London amidst a deserted music festival and Vertigo takes place in India, in a high-tech lab at the top of a towering high-rise building. Interestingly, if they are eaten, there's a new Purgatory area in the afterlife that they'll be sent to, which has new objectives to achieve. All that's left now is their gangster thuggery to protect their brains from being eaten.
Their plan of escape is foiled when, well, zombies appear. The Mob of the Dead story concerns four prohibition-era mobsters who are serving time in Alcatraz Prison. They are Ray Liotta (Goodfellas), Michael Madsen (Reservoir Dogs), Joe Pantoliano (Cypher in The Matrix) and Chazz Palminteri (A Bronx Tale, Bullets Over Broadway, and the main cop in The Usual Suspects). The 'top Hollywood talent' - the actors - featured in the Alcatraz Zombies map, Mob of the Dead, have been named.
Update: Activision has formally announced Uprising, confirming everything below plus adding extra information.
