i read somewhere they are porting XI to mobile devices where you can do stuff together with friends on a small scale in the world of Vana'diel, not MMORPG scale though.

In the Japanese market mobile games are huge. PSVita, Nintendo DS, huuuuge in Japan. Mobile devices today are as powerful as pc's were 8-12 years ago. I look forward to see how this mobile version of vanadiel will turn out.

Phantasy Star Online 2 is another huge game in Japan that has a PC version that cross platforms with a PS Vita version and theres also a smart phone version of the game thats stand alone more or less a single player version of the game.