Like a lot of the rest of you, I don't think character customization will return. It seems like it was a Kalos-only thing, unless that was just an excuse not to include it in ORAS because those were remakes and GF wanted them to stay true to the originals. It's a shame, because I really liked the idea of character customization, and I really want to see GF do more with it (including a lot more options, and maybe more outfits based on other protagonists or trainers, too). As the graphics improve, we see more and more detail in our character. There are a lot of things I don't like about some of the protagonists, and one of the great things about XY was that I was able to change some of the things I didn't like about the character I stared at all the time. I would really like to be able to do the same thing in Sun and Moon. However, there are a lot of other old features I would like back that GF seems to have no desire to see return to the series, so we'll see what happens with character customization.
I must say, though, I was somewhat surprised not to see the skin tone options from XY return in ORAS. I could see avoiding them as a means of keeping the games truer to the originals, but I would have expected GF to fear outcries of racism for cutting out the multiple skin tone options that they had in XY. As it turned out, people didn't seem to be as bothered by it as I thought they would be, but if GF returned any customization option to the series, I wonder if that's the one they would go with.