Recently Hajime Tabata, the director of Final Fantasy Type-0 as well as Final Fantasy XV told the European Square-Enix branch about how he hopes Type-0 becomes a success so he can branch it off into its own spin-off FF universe. Square-Enix already had the idea a few years ago when they trademarked the titles Type-1, Type-2, and Type-3 a few years back when Final Fantasy Agito first received its name change to Type-0.
So what could these future titles be about? Tabata has mentioned that he approached Type-0 as being a playable historical document and loves to take ideas from actual historical events. In this same interview he mentioned wanting to create a scenario similar to the American Civil War. Perhaps this could give us an idea of where his thoughts for the future of the series could go. This all still hinges on whether Type-0 will prove to be successful to the fans when it releases in March 2015 in both NA, JPN, and PAL regions.
Sources:
http://www.siliconera.com/2014/11/04...ntinue-series/
http://www.siliconera.com/2011/01/16...-2-and-type-3/
http://www.siliconera.com/2014/09/02...-love-history/ (Warning this interview contains potential spoilers for Type-0)