I'm still betting for Resident Evil 6, but It looks more like Dead Nation 2 or The Last Guy 2 more than other thing... xD
The Last Guy 2 confirmed! MEGATON! xD
Now seriously, I think it can be both:
-That horror Move game (Until Dawn) teased some time ago.
-A new IP from Guerrilla or Santa Monica, supporting both DS3 and Move like Killzone 3.
-Resident Evil 6 PS3 exclusive, developed by a random western studio as a reboot.
-Valve stuff : L4D trilogy + extras or HL3.
BTW, there are people with masks and appears a quarentine logo, but I would say it doesn't implies zombies.