Valve has announced that its new and free Portal 2 DLC, Perpetual Testing Initiative will be released on May 8th.
The free DLC allows gamers on the PC and Mac platforms to create, use and share puzzles using the in-game puzzle maker that accompanies the new DLC. Valve has also confirmed that the puzzle creation tool can directly publish maps to the Steam Workshop so that players can play, browse and also vote. Downloading new puzzles will automatically be downloaded and installed inside Portal 2.
At present, only the PC and Mac platforms have confirmation that the free DLC will be coming to those systems on May 8th and no announcement with regard to the PlayStation 3 and Xbox 360 versions receiving the same free DLC has been announced at the present time.
Source: Digital Spy.