I don't really like the new starters all that much, but I still love them, if that makes any sense.
Chespin: The design is adorable/boring. The colors are a bit bland, but its hyped-yet-exaggerated face makes it very appealing in some areas. Now that I look at it more, I see that even though it will have the highest defenses of the trio, it will still have balanced speed and lower attack, judging for design. I think it will evolve into a Grass/Dark type. It would be funny to see such a happy go lucky, clumsy-looking Pokemon turn into something sinister and serious.
Fennikin: By far, my favorite of the bunch. It reminds me of Zorua in so many ways, yet distinctly stands out from its fox-like parent. The speed and and attack will be high and balanced with one another; its defenses, however, will be the key to its defeat, taking a good bit of strategy planning and training to overcome. It is likely that it will evolve into a psychic type; its slim figure, good-looking balance, and use of psychic in the trailer almost guarantees it.
Froakie: My least favorite. It has a charming, intelligent air to it, but it still lacks in that... special something that the other generation starters possess (then again, they all do). It will probably have the lowest speed of the three, with slightly better defense and average attack. It might be pure water, but another likely option is water/psychic, though I doubt that they would put two starters in that evolved into half-psychic types. I like it; he's just my least favorite.