Honestly i would not be surprised to see an xbone client revealed at fanfest. Theres not a legion of them but a significant number of people that played XI on their 360 and were gutted the sequel was, for consoles, a playstation exclusive release. With all the final fantasies from the playstation era coming to xbox and a big push for cross play this year i wouldn't be surprised to see those people who sunk so much time into XI finally getting the sequel they wanted half a decade late.
Then the xbone will have something other than Forza worth playing