More test chambers will be coming later in the summer.
Valve has officially announced that the first batch of Portal 2 DLC will (hopefully) be arriving later in the summer. The expansion – cleverly titled Portal 2 DLC #1 – is currently in development and will add new test chambers, leader boards, and a challenge mode for both the single-player and the multiplayer modes in Portal 2.
The best news, however, is that the expansion will be offered completely “free of charge,” so you won’t even have to pay a dime if you’re looking for more Portal and it’s a nice gesture when you consider that most fans would probably be willing to pay. Portal 2 DLC #1 will be available for the Xbox 360, PS3, Mac, and PC.