Since its release over a year ago, fan boys have been waiting and waiting for a (good) map creator for Portal 2. We've been promised one for quite some time, and now Valve has announced that they're making good on that promise. In a video of typical Cave Johnson Style, Valve announced that their "Perpetual Testing Initiative" will launch on May 8 of this year.
Previously there were ways to make new maps, but they were not very well implemented into the game. It was troublesome to do just about everything with them, from making the maps to installing them. Now it will be extremely simple. If you're interested in reading the blog post about it (it's not very long), check it out here. I'm very excited to see what the Portal 2 community will come up with with this map creator.