Portal 2 DLC coming next month and will be free

Do you remember when Valve stated that they’d release a free DLC for Portal 2 this Summer? Well, get ready because it is coming indeed in late Summer and as was promised, it will be free. In addition, the DLC will include new test chambers, leaderboards, a challenge mode “and more”.
That was revealed by Kotaku, as the head of marketing of Valve, Doug Lombardi, told them that the DLC will be out in mid-September.
Lets just hope now that Valve will announce a specific date in the coming days!