I had been thinking there were two possibilities in game at the moment:

1. Similar to the Uq'Braax tribe. Raise animals to fight for you. Problems were Devs are really anti pet anything including reducing Summoner pets into "eye candy" and other classes pets are nothing more than DoTs and DDs.

2. The hunter using Souls of Beasts. Equip regulator in weapon slot, skills change based on Souls uploaded etc. Problems are the example was little more than a berserk Monk and apparently multiple souls uploaded at once causes physical changes and insanity. Also feels a lot like Blue mage only Melee. (Similar to Gau of FF6)

I was wanting 1. but felt they would probably go with 2. due to the ease of development for them until the recent interview where they say they don't want it too similar to other classes. Now I have no idea how they may go.