The topic of player housing continues to crop up as a question on the official forums. Blizzard has stated that guild halls or guild housing will not to be included in the game (at least, not any time soon).
The last game I participated in which had guild housing was Guild Wars. Inside, it stored various mementos and trinkets from different epic quests or sigils that my guild had won in the Hall of Heroes (and this was a long time ago, mind you). But that was it! There wasn't much to do from a PvE standpoint. I think we had our own vendor and a "Guild Lord" (someone like Drek or Vanndar Stormpike in Alterac Valley). Later versions of the game had guilds attacking other guilds on their turf. The guild hall in this respect played a huge PvP component the game because the hall you selected would also be your home base complete with various terrain advantages and defenses if you were "attacked" by other guilds.According to Bornakk:
While this originally came up before I was around, I think this has been answered at some BlizzCons since then. While we think this could be a fun idea, we also like the idea of seeing a lot of people in cities and don't want to make main cities feel like ghost towns - if you need an example of this head to Silvermoon (yeah, that's a cheap shot, I know). So for now this idea remains an interesting idea but we'd have to make sure it fits into the game well and meets our expectations which are pretty high for something like this.
Now that would be cool.
Unfortunately, there just doesn't seem to be a purpose to having a guild hall in the game. However, I'm not going to completely discount the idea. Just because the developers have said they're ruling it out now doesn't mean it won't be included later in the future. Players continued to ask about flying around in the Eastern Kingdoms and Kalimdor, right? All it takes is a new expansion, but at least we're getting it.
I'm shotgunning the Beer Garden.