引用自 seamuspotter：There will NOT be a Portal 3!
引用自 Scale567：I am afraid you are wrong my friend. how do you know?
引用自 Kiki：The only thing they could do is sent Atlas and P-Body outside to harvest humans, if there are any humans left (50,000 years is a pretty long time), but the outside world is not portal compatible, and there's a reason why the game is called "Portal", so there goes that possibility as well.
引用自 Crixus of Gual：Just like there will never be Counter-strike 2.
引用自 Naddalemur：I don't know exactly what they're going to do, but I do know that GLaDOS, Wheatley, and Chell will reunite somehow. I'm pretty sure they'll find a way to put some Cave Johnson in there.