Direct copy of my recent post from the XBOX E3 info thread...
I get your reasoning, but I am not sure if this works out for them.
The main reason being the price for a mandatory Scorpio XBox and the OR set, which right know sums up to a whopping €1.100 to €1.200 (depening on Scorpio's price). And that's the price w/o a dedicated VR controller.
PSVR starts at €750 (w/ vanilla PS4, camera and standard controller) resp. €900 (w/ PS4 Neo and Move controllers), so it's a lot cheaper. Not to mention the 40mn+ PS4 owners who can start their VR experience with a €450 investment, in 5 months btw.
I am not sure if the extra beef of Scorpio and the (slightly) superior OR set will make up for that price gap (yeah, I am aware OR will get cheaper at some point, but so will PSVR).
So, long story short, VR on Scorpio will be a premium prices experience, hence the mass market as well as early adopters will most likely go with PSVR instead of waiting another year.
And my point is: The damage this early announcement of VR on Scorpio resp. the Scorpio itself does to Sony's VR plans (and Nintendo NX for all we know) is obscure. Best case scenario is it will prevent current XBOX owners from switching to the Sony platform. But vice versa? I don't think so. Instead, people will think twice before they purchase an XBOX One Slim if they announce it will be superseded by a new SKU (or whatever) just a year later.
So I really doubt they officially announce Scorpio anytime soon, they'll just shoot themselves in the foot.