I'm not quite sure. Most likely is..again im not sure, but if your Guild Leader purchases Factions, then he can choose one of the new halls (there's bound to be more than 2 though, otherwise people with just Factions will be handicapped badly), and the rest of his guild can go there.
guilds that dont have access to purchase the new halls will still be able to play enemy Guilds that have a new hall, in that new hall.
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