I was browsing the web, and came across these:
I'm putting this out there before anything else: these are in no way confirmed and may be fake.
That aside, these look very much like what GF could do with the starters. They fit with the types that WPM's source gave out (Fire/Psychic, Grass/Dark, Water/Fighting), Fennekin's looks very Fire/Psychic, but I can't really see how Chespin's looks Dark (but then again we've never seen a /Dark starter before so we can't really base it off anything), so I'm thinking it may just be a personality thing. (I was assuming Chespin would get a hood with it's chestnut hat or something)
It also looks like the supposed Chespin evo can roll up to attack. It also appears Fennekin's evo can unfold its tail, so maybe Froakie's evo could do something to do with it's foam.
EDIT: They're confirmed fake. No more to say.