Tbh, Fennekin's final evolution being a Fire/Psychic would be really nice to have, especially how it could use Psychic-type moves and all that. But I'm probably thinking it's just going to be a pure Fire-type, like Typhlosion was in Gold/Silver.
And I'm kind of thinking that the final evolution of Chespin would be a Grass/Dark-type, while the final evolution of Froakie would be a Water/Flying-type.
I could see Froakie being either Water/Fighting or Water/Dark honestly. The white stuff he's got going on behind him could be a thief's bag or something?