I'm going to go out on a limb here and say customizing our trainers is finally coming. My reasoning are a few and ill list them off as so. (Mind you I'm on a iPad so I won't go to in depth quite yet).
1. The trainers shown look just a tad generic
2. Did you notice how the trainer was looking in a mirror? Often times character creators use this setting for the creation set up. The "getting dressed approach".
3. There were no official images of the trainers to be found in the trailer, as I recall all the past trailers always introduced who you're playing.
I know it sounds like I'm grasping at straws and yes I am. But that's the fun of speculation! Ill post more thoughts I have when I can use a key board. But please discuss!