New Portal 2 DLC is already in the works and will be announced for the Summer of 2011. The game may have just come out within the past few days, but Valve isn't taking a break, yet. They're working full steam to make sure we get to have some awesome DLC as soon as possible.
Usually, Valve gives out DLC for free on the PC and I'm guessing that'll be the same for the PS3, since Steam is now on there (if they ever get PSN running again...). However, 360 users will probably have to pay for it, like usual.
http://blog.pikimal.com/geek/2011/04/27/portal-2-dlc-forthcoming/
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