Contests might make a comeback, if only for a brief arc.
Please, no. All the contest episodes bored me in the Advanced Generation series. I'd rather have the anime be more centered on battles again like the original series, which is why I liked the X & Y series so far.
As for May, it would be nice to see her again, if possible. It was just her goal choice of being a Pokémon Coordinator that I never found interesting.
I'm more excited for the idea of next year's movie featuring Kyogre, Groudon, and Volcanion.
I'm sorry, what? Where did you hear that?