I hope they bring absolutely nothing from it to D4. Not even the name, make it Iiablo 4 or something. There's nothing in Immortal that feels like an evolution over Diablo 3 to me and Diablo 3 already wasnt a golden standard to begin with. None of the tedious "community tasks" are what the series need.
D4 is already an MMO-lite with servers and what not. Pretty sure they are expanding to have more MMO-like functionality and likely are going to have many community-related features.