Fans of Left 4 Dead will be happy, as Valve has announced that an expansion pack, dubbed the 'Survival Pack', will be released this Spring, Kotaku reports.
The expansion pack will bring a wealth of new content, including a new multiplayer game mode named Survival, and two entire campaign scenarios for use in Versus mode. So far, it is not known what these will be, nor what the new Survival mode will entail.
Perhaps the biggest news of all is the announcement of a Left 4 Dead Source SDK, for PC. This is exactly what it seems; users will be able to build and distribute Left 4 Dead maps, for use by other players or themselves. Gabe Newell, President and Co-Founder of Valve has stated, "With Half-Life and Counter-Strike, and more recently Team Fortress 2, we've learned that we're no longer making stand-alone games but creating entertainment services. With Left 4 Dead we're extending that tradition by creating additional gameplay and releasing our internal tools to aspiring developers so they may also create and distribute new Left 4 Dead experiences."
Alongside the expansion, a 'Critic's Choice Edition' of Left 4 Dead will be released which will include the new content, for those yet to have purchased Left 4 Dead.