Actually that intergration is something they are touting at the minute Xbox Play Anywhere, it wont work for all games, they want all devices running windows10 to be able to run games, from what I understand the programming language for the Xbox and PC (also the PS actually if I remember old articles correctly) is the same/similar so cross compatability should be achievable especially when you throw windows 10 into the mix, MS are due to float that upgrade out to the Xbox if they haven't already. In fact if I remember correctly the only thing to prevent this on the PS is they use a different OS and I am sure that could be overcome by some genius programmer.
As for the exclusives Gears and Forza will always be favourites but I would be tempted by another God Of War game, also I put a lot of time and effort into my (paltry) gamer score I am wondering if I am more loath to abandon my gamerscore as opposed to microsoft itself.
