I made an account just to post my two cents on the evos of these new starters.
Chespin: With that hood and those claws, Chespin looks the type to be a physical sweeper. The hood gives Chespin the appearance of a theif, and the claws are his daggers. My guess is that Chespin's final form will bear a tiny resemblance to Robin Hood
My guess on the stats of the final evo:
Type: Grass/Dark
Specialization: Attack/Speed
Fennekin: Fennekin bears s striking resemblance to a fox-demon of Japanese folklore. To those of you that don't know, fox-daemon were magical foxes that had the ability to shape-shift into a human form. The females use this ability to lure unsuspecting humans - usually male - and then drain their life-force. My guess is that Fennekin would follow a similar evolutionary line, taking on a human-like posture and gaining the Psychic type, due to it using a Psychic move in the trailer.
My guess on the stats of the final evo:
Type: Fire/Psychic
Specialization: Sp. Attack/Speed
Froakie: The posture of Froakie in the release picture and the trailer show him as militaristic in nature. Additionally, the final form of every Water starter ALWAYS has some sort of auxillary weapon. Blastoise has cannons, Feraligater has teeth, Swampert has it's arms, Empoleon has it's wings (which have blades), and Samurott has a zweihander (made from the two shells on his forelegs) My guess is that Froakie will evolve into some sort of commando/sergeant toad.
My guess on the stats of the final evo:
Type: Water/Fighting
Specialization: Defense/Sp. Defense
That way, the starters can double-counter each other, eg.
Fennekin can use it's Fire attacks to fight Chespin, but Chespin also has an advantage with it's Dark moves.