Yoshida: Actually it was kind of all put into one thing on that document but there are three different ways to think about this. There’s a buddy system for a companion and then you have a pet system and then the summons. The beast pet would be kind of like in FFXI, where you tame it, use it and then it’s done. So there is no growth with the pet. With Summoner, what we’re thinking of is maybe when you summon for example like Carbuncle… that’s not saying that Carbuncle is coming. It’s just an example! But when you summon it at maybe level 20 there will be certain abilities that it can use and then when the Summoner is level 50, that list will be extended with level 50 abilities. Carbuncle won’t change, it will just be the abilities that it can use.

It seems like there will be 2 different types of summons. One where you and your company can summon a primal for a one time use with a long cooldown, and then the actual summoner class who's summons are pets. The bolded makes it sound a lot like FFXI style summoner, where your avatars learned new abilities as you leveled up.