World of Warcraft's Warbands system has been a pretty solid win for the aging MMO, adding a whole layer of alt friendliness to the game—I've particularly enjoyed being able to huck loot at my alts willy-nilly, and the stacking XP bonus you get for hitting level cap on each of your characters isn't bad, either.
Well, there's some more functionality coming to the system with Patch 11.1. As per Blizzard's own patch 11.1 PTR notes, two major upgrades will be arriving alongside Undermine(d), which'll be here early next year.