http://i43.tinypic.com/2whld1g.jpg
Apparently a 'reliable source' is claiming that Valve and EA are set to announce Left 4 Dead 2 next week.
It's no secret Valve will be attending E3, but we were fully expecting to hear about Half Life 2: Episode 3 or some new DLC for Left 4 Dead. A sequel had never crossed our minds, given Valve's history of extended development time.
Nevertheless, Left 4 Dead 2 will seemingly take place at the same time and in the same locations as Left 4 Dead, but with a different group of survivors.