You wanna go through Chespin? You gotta go through me first?
But seriously, I think that Chespin is the best of the starters, just the best looking imo. Froakie comes in at a close second, at least at the moment, it gets better each time I see it. Vulpix is pretty meh. Wait, did I say Vulpix?
Like others have said, I'm feeling pretty confident about the typings. At the very least, it looks unlikely that Fennekin will be Fire/Fighting. As for Chespin, I'd draw your attentions to that red tip on it's tail. It's a very small detail but suggests that Chespin is likely to receive a dual type such as Fighting or Steel. A lot of people are saying Fennekin will be part Psychic, but I think that's a higher possibility for Froakie. His glasses suggest a high special attack and intelligence, and Water Types are known for being predominately specially based. So, I guess, if there's a Fight/Dark/Psychic core going on here, that makes Fennekin part Dark in the end, which isn't unlikely. It's a cunning fox, you see. I think, if this is the case, we can expect a suitably badass, shifty looking final evolution.