Changing cries is probably one of the worst things they could do imo. Cries are very good identifiers of Pokemon (except for a few similar ones) and are a nod to the originals... it's just... I dunno, I feel like they could've done something better with that effort, like, you know, coding Pokemon to be able to walk behind you again. It's a move that makes the new cries stick out and I doubt they are going to redo 700+ Pokemon cries to fit whatever new style they seem to be aiming for with this.
On the other hand, Mega evolutions are really nice (<3<3 MegaAmpharos), and I'll also skip hearing the soundtrack early as it spoils the experience for me in game.
Also, lawl that if someone has B, W, B2, and W2, they could get 4 shiny Dialgas right now.