Valve has confirmed that it will be releasing downloadable content for Portal 2, though it has remained vague on the details of whether the content will be free or premium. The confirmation come via Valve's Doug Lombardi, who mentioned in an interview that downloadable content for Portal 2 was planned for release this summer. 'We will be announcing some DLC for it, so folks can keep a look out for more content coming this summer,' Lombardi told FastCompany 'We'll be putting more details ...