There is always bluestacks if you're not excited to play mobile games on an eye straining display that has to be held a half an arms length away or huddled over to view properly.
I doubt it will have any x-platform play if it is a new mmo experience and not just a way to port the story over to a solo play style so they can finally have a reason to pull the plug on the servers but still maintain a way for all numbered final fantasy titles to be played.
Not saying I want to see that happen but I could very much so see them think about that option.