This is from the planned changes notes midway through the latest Letter from the Producer:
Introduction of public companies.
Introduction of public company leaders in each city-state. Announcement of further changes as they arise.
Introduction of public companies in Limsa Lominsa, Ul'dah, and Gridania to combat the threat to Eorzea. Announcement of further changes as they arise.
So I was thinking and hoping that these would be guilds (not just Linkshells) that would have things like housing and what not. Just reading that bit of information though makes it seem more like a more player involved Conquest system from FFXI. Its got the whole three nations thing going and a leader for each nation. I hope I am just misreading what this possibly means. I mean I am all for Large-scale PvE content with indirect competition between the nations, but I would still like actual guilds with all that comes with them: housing, banks, special services (like guild only NPCs: repair NPCs etc.), and guild emblems (because it would be so cool) so we can wear them and easily identify who rolls with who.