Remember Portal 2? Remember how Valve had promised free DLC for the game back in April? Notice how it's... um, not out yet? Did Valve forget all about it? Is it being released alongside Half-Life 2: Episode 3?

No! Thankfully, Valve hasn't quite forgotten about its multi-million selling sequel. Valve's Doug Lombardi told Kotaku that the upcoming downloadable content will be available in September. That is "still technically summer," for those of you looking at your Valve clocks.

Unfortunately, the company rep offered no additional details on what the DLC will entail. From the April release, we understand the expansion will offer "new test chambers, leaderboards, both a single- and multiplayer challenge mode, and more." The pack will be free on all the platforms: PC, Mac, PS3, and Xbox 360.

If you desperately need more Portal 2 content now, make sure you pick up the PC/Mac version. You can download some fan-created challenges. If you have a lot of money to spare, the Razer Hydra peripheral also lets you access some specially designed levels as well.