I do hope that there'll be customization, but like most of you, I doubt it. I like it when the players can get to choose what their character will look like and have the ability to personalize them however they want, which is probably the reason why I love playing games like The Sims.
But... customization IS in X & Y.
I'm getting more and more excited about player customization as I see more trailers with customized trainers. It's like they took what Pokemon Battle Revolution started, and made it 10 times better. I hope there will be lots of different things to dress your character up in, rather than just a few.