I hope Fennekin isn't fire/fighting. They've done that too many times already with Torchic, Chimchar, and Tepig. The rumors flying around the web suggest that Fennekin will be fire/psychic, though my speculation is fire/normal like other "fire dog/fox" pokemon like Growlithe or Vulpix.
Some rumors suggest Froakie will be water/fighting, but I speculate water/ice since his white wisps look like snow clouds on high mountains, "fro" is half of frozen, and there are frogs like the Alaskan wood frog who can freeze themselves into hibernation and generally survive winter climates.
Chespin's rumored to be grass/dark, but I speculate grass/fighting because of those slashing claws.