Announced during E3 2016, Bethesda’s Pete Hines revealed that the game will be released on the HTC Vive in 2017. Note that this isn’t a demo of the game, as in just to show off virtual reality technology. This is an actual full-fledged release of Fallout 4 for the HTC Vive meaning that you’ll get to experience the game in its entirety all over again in a virtual reality setting.
For those who are attending E3, Bethesda also revealed that playable demos of Fallout 4 and DOOM in VR would be available, but unfortunately the company did not state whether or not DOOM will also be released in VR, although we can only imagine how much more fun and scary it would be if it did.
Also there was no mention of Fallout 4 launching on the Oculus Rift or the Sony PlayStation VR, so for now we can only assume that it will be exclusive to the HTC Vive until we are told otherwise.