The Left 4 Dead team has released the Extended Mutation System for the L4D2 Beta program, which will allow modders help test the expanded tools before it gets released into the Steam Workshop.
The EMS is a drastically improved scripting system that allows script authors to go past modifying existing scripts and write custom script logic, spawn and control entities, allowing modders to create customized campaigns, such as a survival mode called Holdout, which the L4D team included as an example.
The following images are from the Holdout mod.
The beta team also created a wiki to guide the modders through some of the features of the EMS.
The EMS will be in beta long enough to accomplish the following goals:
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Find out what new tools people use, and how well they work.
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Find out what are the most important missing features we can add.
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Drive out as many bugs and issues as possible.
Check out the blog post here.
