I don't think HL3 is going to get made until Valve releases the rights and someone else does it. I've read that Gaben himself never really liked the franchise. That said, HL3 or any other quality FPS would be amazing in VR. Check out my review of Shadow Warror if you like - it'd be perfect for a loose, crazy VR experience. https://steemit.com/videogames/@nerdfury/far-from-the-pulse-game-review-shadow-warrior-2013-finally-a-game-i-love