Guild halls
They are working on guild halls from rumors I’ve heard.
We might not see them till a full expansion is released or Guild Versus Guild(GvG). I figure Anet will want to release them with GvG battles, meaning they are putting a great deal of effort into creating them.
They will need to be not just staging points for guild mates to gather but they will be mini cities with acquirable npc’s through influence upgrades. Even more than that they will be massive pvp arenas full of content.
In addition Anet will likely add many themes to select from for a Guild Hall and new themes will likely be added as we encounter new areas and face the other dragons.
Don’t underestimate the amount of time it will take to create them.