Valve has confirmed that downloadable content will be coming to Portal 2.
“We have a DLC that we’re going to be announcing,” he revealed. “Really can’t give you any detail [until] after launch, and we’re going to have some details about how that’ll get released and what that’ll form forthcoming.”
When asked whether the content will comprise of new stages, Faliszek replied: “We’ll see”.
Faliszek also explained that the “most important” aspect of Steam support for PC, Mac and PS3 was that they could be regularly patched to enable cross-platform play.
“It’ll let us update more frequently, which is a big thing especially because the PS3, PC and Mac can all play together,” he said.
“And so why they might not get every single patch as some are PC-dependant or just for the PS3, it’ll let us keep those in sync so they can do the cross-platform play. So that was the most important [thing].”
Portal 2 will be available on PC, Mac and consoles from April 19 in North America and April 21 in Europe.
Source: https://www.digitalspy.co.uk/gaming/news/a313590/portal-2-dlc-to-be-announced-after-launch.html
Full interview with Chet Faliszek about Portal 2 DLC here: https://www.digitalspy.co.uk/gaming/interviews/a313581/chet-faliszek-portal-2.html
I am glad that valve does not charge for DLC games on steam, so this DLC of Portal 2 that is coming I guess it will be free.