My biggest 2.1 wish is a buff to Avalanche. It was the new skill with ROS but seems like it wasn't fully fleshed out. It hasn't found a spot in any T6 viable builds that I know of. The skill setup is pretty awesome, not a fury spender just a cooldown that reduces w/ fury spent. I don't know if it's main drawback is straight damage or if it needs a better supporting attribute like stuns, freeze length, pull etc... Anyways I think playing the barb would be a lot more fun with Avalanche as a primary build skill.
Whats number 1 on you 2.1 wishlist?