None of that means anything to someone without an XB1. Here’s a thread where Rukari explains that cross-buy requires logging in to the Xbox.
I’m with you OP on wanting Windows Store pricing.
My guess is that the W10 version is going to be $50. $10 less than the Xbox version just like Gears. I could see it including the retro costumes as an incentive for buying it in its first week.