Legendary items that boost followers special abilities would be nice. Some of us just love to soloing with their followers abilities(ex: enchantress hex). As long as its not game breaking, Blizz can always balance this!
There are two new Legendary items just for Followers, but technically six since they each have a specific version for the Scoundrel, Templar, and Enchantress. One of them prevents your Follower from dying, and the other allows your Follower to use all of their skills. If you find one of these new Follower Legendary items on the PTR then be sure to give it a try and let us know what you think.