Valve wrote:
What is a three? I know we used it in TF2, but the reason there will be no HL3 or Portal 3 is because we think that the portal series should end here. We're serious: If we made a Portal 3, we would have to come up with a new main character, and a new Aperture Science. Well, it wouldn't be named that, and if we did make Portal 3, newspapers and Portal forums would be probably spammed up with topics named "VALVE FINALLY LEARNS TO COUNT TO THREE!".

Do you agree with Valve?

asdfasdfasd can we stop with the speculation about a possible far in the future portal 3? there are a gazillion threads about it on the interwebs already and making a new one is only annoying.

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If there is an announcement for portal 3 ever. We'll post it in the news section don't worry.