This BlizzCon we're hearing a lot about the ways guilds will be changing in Cataclysm. Not only will you be able to contribute to your guild by doing the things you already do like daily questing and PvP, your guild will be able to use its new abilities to directly benefit the members in various way. Even more intriguing is the talk of being able to transfer an entire guild to a new server at once.
However, even as things change for guilds, one thing remains the same: you will not be getting a guild hall. You're going to have to keep hanging around on the streets with us Hoi Polloi, I'm afraid. Still, what we are getting is extremely thought provoking on its own.