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Portal 3 isn't happening (yet), but in a recent interview the series' writer Erik Wolpaw did say he knows how it would start.
Speaking to DidYouKnowGaming, Wolpaw spoke about some behind-the-scenes information about both Portal games about characters like Wheatley and Cave Johnson, and cut content from Portal 2. Perhaps most interestingly for fans of the puzzle-shooter, is the fact that Wolpaw spoke about Portal 3, which to be clear doesn't currently exist in any material form.
"Jay [Pinkerton] and I have an idea that we think is pretty awesome for what would happen, generally speaking," Wolpaw told DidYouKnowGaming (Pinkerton being the co-writer of Portal 2). "We don't have a script or any details worked out, but we have sort of a starting point that we like a ton.
Unlike buses, Valve games do not come in threes. That isn't about to change anytime soon, but one of the main writers behind both Portal games has revealed that they've got a "pretty awesome" idea for Portal 3. Erik Wolpaw say he and fellow Portal 2 penner Jay Pinkerton have even floated that idea around Valve, to a positive response. It's totes on the cards, is what it sounds like.
The news comes from Wolpaw's recent interview with YouTuber DidYouKnowGaming, which is also worth a watch to learn about all the ideas Valve didn't wind up using in Portal 2. At one point it had bullet time.