They recently made Shadow lair mobs scale damage/defense after level 30. So there are some hints that they would be making a Tier 4 and maybe missions along with it. But those would probably take eons to develop (I mean, just look at how long it took them to churn out treas(h)ure vault). But I highly doubt it will be worth the grind seeing as GH seems to think punishing difficulty and low reward is what the community (maybe the masochists) want.
They recently made Shadow lair mobs scale damage/defense after level 30. So there are some hints that they would be making a Tier 4 and maybe missions along with it. But those would probably take eons to develop (I mean, just look at how long it took them to churn out treas(h)ure vault). But I highly doubt it will be worth the grind seeing as GH seems to think punishing difficulty and low reward is what the community (maybe the masochists) want.