Final Fantasy 14 could find its way to the Xbox One if Microsoft is willing to tweak some of its regulations. According to Final Fantasy 14 director Naoki Yoshida, Square Enix is currently in discussions with Microsoft.
"Microsoft actually approached the Final Fantasy 14 team about the cross-platform opportunity," Yoshida told Polygon. "When our team reviewed the regulations that are associated with that, we realized that Microsoft may not have the experience or understanding of running an MMORPG as an online game genre just yet."
The Final Fantasy 14 team expressed these concerns to Microsoft, saying there are "certain elements of its regulations that [Square Enix] would have to consider waived." The developer is currently awaiting Microsoft's response.
Source Link: IGN
These talks have been going on since the launch of FFXIV 2.0, and won't get anywhere unless Microsoft gets rid of these two requirements. Xbox Live players will always have the option of choosing to play only with other Xbox Live players, and the requirement to have XBL gold. EX: DCUO recently launched on XB1, and servers are still separate due to them requiring XBL subscription, and DCUO is a F2P MMO.
Will it happen? I still don't think so. Yoshida doesn't want to separate the playerbase, meaning XBL players would be isolated.