Based on feedback from Sam, indeed, seems like it would be category based.
Going forward in that direction, I think it would be great if :
- Chat were visually separate from topics when browsing a category. The reason for suggesting it is that chats are normally very active so they would be most of the time on top of topics. It would then tend to make chat the easiest “way” to go into a discussion instead of going to the “right topic”;
- There was a support of search on chats(I have seen that already being asked somewhere);
- Mentioning a chat like we do categories (Community Building ?) would be also awesome.