The content with Brint/Brienne's house and family is supposed to come eventually, I would say Mayternity but I don't even know if it'll come then. It's massive from what we've heard but considering the amount of variables involved it's possible that while the document is massive, it may not feel that way to the player since you'll only see the variables that apply to you. No way of knowing till it comes though, regardless I bet it'll be pretty good. Also supposedly Khor'minos will involve some Brienne lore as it unfolds, no ETA at all on that though.