Capcom and Valve's recent announcement for characters crossing over between Left4Dead 2 and Resident Evil 6 was well received by fans of each game and with Capcom already holding up its part of the bargain, valve has released a new video showing one of RE6's baddies "The Napad" terrorizing Ellis, Coach, Rochelle, and Nick.
According to the last update, Lepotitsa, Napad, and Ogroman will also be available in Left 4 Dead 2 sometime in Spring of 2013. Ellis, Coach, Rochelle, and Nick will be available as playable characters tomorrow with a free update. If you ever needed another reason to buy Resident Evil 6, I'm sure this is be a good incentive to buy it on Steam. The crossover is exclusive to the PC version of both the games.
Source: Joystiq