I would really like to see some more challenging light party content added to the game, weather it's just harder dungeons/trials or something new. My friends and I often go back and unsync/undersize raids and trials from previous expansions and figure out ways to complete them with only 3-4 people. It's lots of fun, but it would be great to have some endgame stuff we could do as a group as well.

I think a harder 24 man difficulty would be interesting as well. Maybe just make the rewards the same as the normal version, but dyeable like they do for the 8 mans.