If it doesn't meet VR minimum specs then AMD has really missed a golden opportunity that nVidia handed them. The prestige is in the high end cards, the money is in the mainstream & mobile ones.
VR's steep requirements plus the really nice performance bump we're getting from finally getting off of 28nm means that this is probably going to be one of the most vigorous upgrade cycles for GPUs that we've seen in a while.
Whoever decided to save a buck back at ATI and not hire a massive driver development team a couple decades ago did irreparable harm.
I was planning on waiting for a mainstream version of the 1070/1080 from NVIDIA to use in a Thunderbolt graphics dock with a Thunderbolt 3 compatible ultrabook, which is a setup that, I assume, will be far more limited by the ultra low voltage CPU in the ultrabook than any mainstream graphics card from this next generation anyways. But it looks like Polaris might fit the bill and release sooner.
https://youtu.be/vGFRoWj0YOw?t=181
Compatibility wise they're supposed to work with any laptop that has Thunderbolt 3, supports the Intel eGPU UEFI extension, and is running Windows 10.