I want a LS/Company/Guild based house (name depends on what Yoshida plans to do... not sure if the player run company has been trashed or not).
Something I can use for gathering near event time, a place to hang out, a place for extra personal storage, maby a group calendar to hang on the wall for scheduling things (like a personal message board), and maby a guild bank type thing.
Several others have mentioned gardening I really want to see that come back as well, was something fun to do between everything else.
I really like the idea of linking housing to crafting as well, let crafters at least furnish the houses.... if they really want to go all out and above and beyond other mmos incorporate all the crafts not only furnishing the houses but actully building the house, the whole group crafting thing that I liked the sound of from the Tanaka days >.>