With HoT, there seemed to be a large focus on large group open world content that was hard.
So this got me thinking, should future expansions have a similar objective (where they introduce a lot of open world content that requires a sizable group of people)? If yes, what possible troubles do you think can arise from it (such as population concernts among old and new content)?
If no, what design objectives should be focused on? What type of content? Dungeons, fractals, some form of instanced content, large explorable zones (like Lornars Pass), etc?