Maximum PC took some footage from a portion of Valve's talk on virtual reality. During the talk, they showed off a short "Aperture Science VR Demo." It's important to note here that while we believe this is running on Source 2 (the lighting could be a big sign of this), it was not specifically announced as running on Source 2.
Even if it wasn't Source 2, the fact that it's VIRTUAL REALITY should be awesome enough for anybody!
Even if it wasn't Source 2, the fact that it's VIRTUAL REALITY should be awesome enough for anybody!