I have read this https://blogs.unity3d.com/es/2020/01/24/unity-xr-platform-updates/ and if i understood well if i make a game with the new OpenVR Unity XR plugin it will work for any other platform Unity supports like PSVR ,Mixed reality or Occulus?
And anyone has any idea when this plugin could be released?
No, its the other way around. If you write your game with XR Platform, then it can be built for the various target platforms and XR Plugin devices including MR and Oculus. And eventually for OpenVR when that plugin is released.
You are the creator of BridgeXR. I am using Steamvr 2.5 atm, so i am using many Steamvr scripts for bow, hands,etc… so dont know how your asset could help me to make it compatible with other platforms, like psvr for instance