We know virtually nothing about Half-Life 3. We don't know if it exists in any kind of incomplete state, or if not, if it will exist at all at any point in the near or distant future. We don't even know if Valve wants to make it exist at this point. But we do know, thanks to Valve's Chet Faliszek, that it will not be a VR game.
As reported by VG247, Faliszek was asked following his talk about VR at EGX if Half-Life 3 would be a virtual reality game. "No," he replied, before moving on to discuss how the bandwidth requirements of VR headsets mean they won't be going wireless anytime soon. But the Half-Life inquisitor wasn't ready to give up quite so easily, so he asked again.
"I said no," Faliszek answered again. And that, apparently, was that.
So, Half-Life 3 isn't being developed for VR? Or Half-Life 3 isn't being developed at all? For such a succinct answer, it sure leaves a lot of room for interpretation. On the other hand, he didn't deny that it's being made. Half-Life 3 not VR confirmed.