First, I'm not a Vue subscriber and never have been. I've not installed any Vue apps on any of my devices and don't know what happened.
Now, that said, since Android 7 hit my devices the PlayStation Vue app is installed on all 3 of my Nexus Players. All 3 eventually ended up on the preview releases, but not at the same time.
I have no idea how this happened.
PlayStation Vue https://imgur.com/gallery/3zpJz
Edit: just to be clear, this had to have happened AFTER the final Android N release hit my devices.
Hopefully this means that AndroidTV is about to become a preferred platform for Vue.