[drzaiusapelord]

HL3 is a traditional FPS and a lot of people would be unhappy to play it with a teleport mechanism or other solution that solves the simulation sickness/locomotion problem, but drastically changes the game experience. Worse, VR will never have the install base PC's have right now, so Valve would have to skimp on HL3's budget to make it economically feasible as a VR-only game.

Portal 3 on the other hand seems likely. The teleport mechanic is already cooked into the game. You could play it in VR or non-VR without any changes or upsetting fans.

As a Vive owner, I don't want shoehorned in half-assed VR experiences. I want something that properly uses the medium. I think a lot of FPS fans are going to be ultimately be disappointed that standard WASD and or trackpad locomotion are just not an option in VR.