Team Skull uses industrial music for their encounters and fight.
Gladion's theme is intense.
All possible new mons, other than ones you're forced to encounter, were hidden by having Pikachu take their place. Lots of Pikachu.
Many new characters introduced.
Somewhat unrelated, but a new pokemon was leaked by an official source through the TCG preorder.
Water Shuriken is a special move now, not physical.
Greninja from the demo has higher BST than a normal Greninja.
So far, that's all.