The second round of Portal 2 DLC is on the way, although its release will come a bit later than many folks may like: early 2012. The Portal 2 DLC will feature an easy-to-use in-game map editor.
Using the Portal 2 map editor, players will be able to design, build and share their own single-player and co-op test chambers with the online Portal 2 community. In turn, the Portal 2 community will be able to view, play and vote on the user-generated levels with a simple click.