Unrelated to the complexity of the job, but thematically I wasn't expecting to see more than the basic Primal trio for now, simply because they could save the additional ones for 7.0. I was halfway expecting a new Demi to be introduced somehow, but I could see Bahamut or Phoenix phase changing into it for 7.0.
The thing I was thematically expecting and didn't happen: The LB3 animation being switched to a huge primal like Leviathan.