This version was not supposed to have any modifications in VR. We are reworking VR support in a separate code branch, but it was not yet ready for release. Unfortunately something broke in this build, and we are fixing it.
As stated by the devs, the newer versions will have (only) Vive Pro support, because they can't get their hands on a Rift in Slovakia. Oculus is not shipping to this country. This is what the devs said. I still hope they are doing an OpenVR port (a Valve/Steam thing) to get Rift on board again.
Not entirely right - we can get Rift in Slovakia, several retailers are selling it. Oculus/FB is just not selling it directly from their store, and when I asked them what's the state of my Kickstarter Edition Rift I was supposed to get 3 years ago, one of the excuses they made was that Rift is not supported in Slovakia and it may not work because mysterious ways.
Without a plugin VR rendering system we can have only one VR back-end linked in our executable, so the decision to drop Oculus was easy after this. Some next version will use only OpenVR back-end, supporting SteamVR directly. Oculus should still work through SteamVR as countless apps do.