Some devs looking back at ANet’s Living Story, and a tiny (non-story) teaser for Season 5 plans, right at the end. Don’t worry, nothing in here is a spoiler.
Hang on, a “personal character instance.” That sounds like housing.
I can imagine it growing into player housing eventually. To me, it sounded more like a variant on your home instance. Maybe something like WoW’s garrison system (though hopefully much better and less of a game killer).
Of course, we can all make it mean whatever we want, considering the brevity of the teaser.