Curious what everyone would want.
I hope they upgrade "house" to a "Keep/Fortress" deal, that is always a lot more entertaining. Add more of a town aspect, building, missions, the people inside. Have a few missions to gather a small force to defend it. A lot more possibilities when you exit the realm of a simple house. Also having places for your companions to stay, is pretty neat.
On a more realistic note, one of my favorite "housing" aspects I've seen in a game, is mass amounts of Trophies (Achievements). I LOVED how Dungeon Defenders did this. They went a bit extreme, obviously tone it down, but seeing my accomplishments makes me happy. Buy some plaques so you can take the heads of your favorite kills, and put em for show.