This is part of the L4D SDK rollout, which is currently in a closed beta and will be released shortly after the launch of the L4D Survival Pack.
So if the Survival pack really does come out at the end of April hopefully we can finally get our hands on the SDK shortly after. Been roughly 4 months since L4D hit the shelves, and we're still waiting for the SDK so your guess is as good as mine as to how long shortly might be.
Check out the full post.






















