Imagine anything you could add/change in game to match your desires and write it down.
Maybe we'll see something of our ideas in upcomming patches
for me it's:
1) some nice combat animations (where are those neat combos we see in every second game) and skill driven combats with options to insta kill when doing it well.
2) arrows of insta kill - headshots (not to be so easy, it'd be based on precise aiming and some sklil tree ability)
3) horadric cube (you know the cube in diablo with, sometimes, unpredictable results - you put some things inside, push the button and voila - another thing is created from those used)
4) mobs and bosses in zones spawned once for each player, reset by leaving zone (more enjoyable gameplay when soloing)
I'm fighting for a higher purpose