XSEED only localizes and publishes games. They don't develop them. Their parent company, Marvelous, owns the IP for the Rune Factory games now I believe so they'd be in charge of funding development for a new Rune Factory. Also, Tom (Wyrdwad) and Calros (I think?) are the more frequent admins on the forum, and they both work as translators or editors depending on the title, so they're involved in whatever projects XSEED's currently working on.