Ishgard and changing City-State

[Bluevann]

You sure about that?

From the old Lodestone:

The Grand Companies of Eorzea are a military alliance of nations united in common cause to avert imminent catastrophe from engulfing the realm, each city-state charged with mustering its resources under the banner of an elite regiment.

Grand Companies are organizations that take the burden of organizing and administrating a city's military power with the aid of adventurers, sellswords, and freelance suppliers such as crafters and gatherers, and their leader works, if not as the city-leader himself (Merlwyb, Kan-E Senna), as a close second to that (Raubhan, member of the Syndicate, without which the Sultana cannot act). The Holy See is fully in the hands of the archbishop, who controls its economic, military and internal as well as external affairs in all their aspects. To allow a Grand Company to be established within Ishgard would go completely against the lore of fully independent, self-centered and xenophobic state as the one the Holy See is.

TL;DR: Grand Companies are, in short, factions established to unite resources in nations where they would be otherwise not be gathered together. The Holy See already has all its resources gathered under the will of the Archbishop, and as such, do not require a Grand Company to be formed.

I could have swore they were getting a GC?

I believe what you're thinking of is the news we received that the Grand Companies will receive new ranks. That is confirmed, but it's only applied to the three starting cities' GCs.