More guild tools including a much needing increase on the guild cap of 500 where one player can have 22 characters. For larger guilds like us, despite guild management we are no longer able to recruit members as we are full (petition on suggestions forum) http://www.swtor.com/community/showt...=603918&page=1
More ingame social features. Pazaak, interactive cantina's, racing.
Ability to decorate/add items to ship to make it feel like a home. Better still guild ships with rooms for members (like housing)