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"One of GTTV's world exclusives during last night's broadcast was this Portal 2 trailer for the next free batch of DLC, the Perpetual Testing Initiative. The DLC allows players to create their own puzzles and publish them to Steam Workshop for others to critique and play.The Perpetual Testing Initiative goes live on PC and Mac on May 8 &amp;ndash; still no word on whether consoles will get this DLC, but at least we all get a humorous new trailer narrated by Cave Johnson right now."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/04/27/portal-2-perpetual-testing-initiative-dlc-trailer-introduces-m/>