Hmm I guess I can share my personal opinions regarding the leaks too... okay, here we go!
Mega Garchomp: This thing has "I eat babies!" written all over it's head. I love it's jaws but that's all about it, everything else is "meh" and the white spikes are overdone (poor thing looks like it's wearing an appron with laces <_< Good luck trying to unsee this now!)
Mega Mewtwo X: Uhh...no. It looks Mewtwo-ish I guess, but I personally dislike it's design. Good thing I'm getting Y, I do like Mega Mewtwo Y's design in general.
Torimian: A poodle, huh? Not bad (I was betting on llama xD) I really like it and the idea of customizable Pokémon, though I prefer it unstylised ~
Nyaonikusu: I FREAKIN' LOVE THEM. Especially the male. More Pokémon need gender differences like this duo. Definitely getting one for my team. I also wonder what their shiny forms might look like, if they were to reverse their colors and the female would be dark, I'd totally try to get one and name it after my black cat
Chigorasu: HELL YEAH! Thank you, GameFreak! I've always wanted a fossil Pokémon based on either a Tyrannosaurus Rex or some sort of Raptor. Totally picking it's fossil and it'll definitely get a spot in my team! Love the typing too!
Amarusu: Umm...ugh...idk, the design looks like a third rate fakemon's (no offense meant, everyone has different tastes and if you like it, whatever float your boat! :3 ) but I'm glad there is a Sauropod Pokémon now too. Also interesting ability.
Hariboogu: O_O Chespin my darling, you need to lay off with those poffins! I can only hope the last stage will be awesome and this is just a silly/awkward teenage phase xD Still my starter choice but it will take some time to get used to this stage. I don't hate it...but I don't really love it either.
Teerunaa: I understand those who hoped Fennekin would stay quadrupled and I sort of hoped too, but I actually like it's design! I like the broomstick tail idea too and the fact that it seems to be using the stick as a magic wand in battle.
Gekogashira: I didn't really pay much attention to Froakie until this point but it certainly evolves into something awesome! I love it how it resembles a tree-frog thief. It looks so sly!
Pyroar: Brick me but I was actually hoping for it to become a Fire/Dark or Fire/Poison manticore Pokémon. The colours would have been perfect! Oh well, it's okay I guess (I sorta like the fluff on the hindlegs) except for one thing - the mane. Oh god, it's too big, too awkward shaped... it should be fluffier like a Luxray's, only proportioned right. I really hope the females either have small manes or none at all.
As a side thought, I like it how GameFreak is basing the starters on the holy trinity of RPGs:
It makes perfect sense! I just hope Chespin's final stage will look like an actual warrior/knight rather than something...round and chubby?