Portal 2 DLC coming this Summer; free of charge

In a press release today Valve gave us a glimspe into their first upcoming DLC for Portal 2. Doug Lombardi already let it slip in an interview that the first DLC was en route for a Summer release. But the best news of all is that Valve will be charging you exactly $0.00.

The DLC will feature new test chambers, leaderboards, challenge mode for single and multiplayer modes; and will be free across the board whether downloaded on PC, Mac, Xbox 360, or PS3.

Valve also made it known that Portal 2 is their fastest-selling game since the seminal Half-Life 2 back in 2004. The sequel to 2007?