Valve's official announcement of sort-of-Half-Life-3 is a done deal but it's not just about the launch trailer - there's The Final Hours of Half-Life: Alyx - Behind Closed Doors at Valve documentary too, whose leaked transcript was spot on.
Well, at least in terms of the things that were said , because the third person that was unnamed at the time turned out not to be Gabe Newell. The documentary features David Speyrer, Robin Walker and Dario Casali, along with Geoff Keighley, who did similar features for all Half-Lifes and Portal 2 as well.
So it was not GabeN but Casali who said "Yeah, I mean we would love to be delivering a version of this that you could play with a mouse and a keyboard, but, like, as we said, it began as an exploration of VR", which when isolated sounded as if there's a possibility it might happen at some point.
Unfortunately, Half-Life: Alyx was built to utilise just about every aspect of VR that translating it to keyboard and mouse would not be tedious to both design and play - every motion would require key mapping. I mean, they might as well do Half-Life 3 from the ground up...to which we wouldn't terribly object, of course.
"The more we explored those mechanics, the more we realized that in order for us to deliver a keyboard and mouse experience, we would have to ship a game that's missing many of those interactions", Casali. Speyrer agreed and said that it would end up watering down the VR experience of Half-Life: Alyx.
Valve's idea for Half-Life: Alyx came on the back of customer demands for a real VR blockbuster, not just an exploration of the medium or a gimmick game. The game officially launches in March 2020, and we must admit - the trailer is quite inviting.