Ummmm already is ? Almost every dungeon from 3.0 and a few from 2.0-2.55 have minions (Unicolt, Demon Brick, Morbol Seedling, Lesser Panda, Baby opo-opo etc). Raid minions off the top of my head there was one rewarded at the end of the FCoB and a minion made from the crafting material dropped off of A4 normal.