Shardstone
Hero
I can say that I really want every barbarian subclass to be magical in the future. I think the barbarian as a warrior who channels magical forces and goes crazy with unrestrained arcane/divine/primal/psionic rage is super cool and has a lot of room for many subclasses to fill. I'd love to see a Path of Sin Barbarian that is fueled by the anguish of the sinful throughout the Nine Hells or a Path of Dragons where you gain various draconic features as part of yoru rage etc etc etc. At long last let D&D have an actually cool magic warrior.