I wanted to wait til all the scans will be out, but I just can't help myself, so I write my first opinions on some cards:
Drowzee Cool! Something I dreamt about: any coin flips are treated as tails at your opponent's turn. Not only for attacks, but also for coin-flipping trainers – that's really cool. It has only two drawback: 1) This attack has no Hypno… once you evolve it, you lose this cool attack. 2) You cannot do any damage. It'd be even more fantastic, if it does at least 10.
Hypno Is also cool. If you're lucky, you may use e.g. PokeCenter Lady from you opponent's hand onto your own Pokémon, or anything else. It definitely sees many play.
Jynx A weaker version of BW Serperior, but it's exactly, what I'm looking for! The healer, that's not a Stage 2. It really helps my decks partially.
Skorupi Though I'm not big fan of this (for me ugly) Pokémon, I'm glad, we can see this evo-line after many months (years?).
Gothita-line Basic is pathetically weak, Stage 1 got
this Gothita's attack and Stage 2's Ability will be maybe something,
this Gardevoir have.
Blaziken is killing machine. With Blacksmith it can deal 150 damage each turn… no other comment is important.
Eeveelutions Glad, Eevee got back its Ability for energy evolving. That means: no attack needed (and for DCE only 10 damage? Weaker then Magikarp…). Cool all Eeveelution introduced by far have for 1 Energy 30 and effect.
Tool Stripper Exactly what needed if you don't want to run Masquerain in your deck and need to change tools…
Radiant Gown OMG! Bye-Bye Hypnotoxes, Virbanks, Crobats and Toxicroak EX's?!
Dedenne We don't get the Nuzzle one? Oh bo; I'd like to have some japanese promos translated! (e.g. Hand Scoop…)
Fossil researcher's restriction is too cruel for fossil lovers…
Seismitoad EX Excellent… maybe not. I hope, they'll make any card, that forbids
all trainer cards from being played. The second attack forces you to use Mr. Mime or another bench protector, which is useless…
Mega Heracross For 2 energies cool attck. For 3 energies no more… but the Herb energy will be some kind of support. (Hoping for all types of special energies for all 'mons)
Training Center Incredibly high HP will go even higher! Let's pretend 250 HP M Charizards…
Korrina's FA looks amazing! OK, I'm her fan…
Dragonite EX Self-generator! Cool.
Machamp + Strong energies + Fighting Stadium… go to hell all fight-resisting 'mon's with HP < 140…
That
Hawlucha is pretty useless when you don't stay against an EX… -_-
Clawitzer! Tha's an imagination for crustacean for me! (Hoping for Kingler in next set
)
Noivern Though hoped for the XY trainer kit one, but this one looks like Cinccino (or was it Minccino? Don't know – the Stage 1 with Smooth cover or what is its ability called). That attack is cool but pretty expensive for only 30 damage to each.
Victreebel Finally! After so many milleniums! Though hoping it will be out alongside Vileplume, I'm glad.
I really like the Heracross EX FA illustration! It looks awesome.
Didn't expect Accelgor in this set. Well. It's not as good as its Noble Victories version. I really like that strong hitter.
Magmortar/Electivire combo may be good, though it forces you to use lightning/fire deck…
Politoed/Poliwrath killing combo will be good only if you get all cards super fast; though with some luck, it's possible. Destroying opponent's Pokémon with no energies is always cool.
Another annoying Pikachu-oid mons in this set. Not only Dedenne, even Plusle and Minun -_-
btw. to that one, who asked the question about Gothita (somewhere below this post): It really paralyzes the foe; so maybe the attack's name is wrong.
I don't think anybody will use Hitmonlee's second attack, if you can use the first cheaper and for same amount of damage.
Though didn't expect Makuhita-line in this set, Hariyama is pretty good (except for Retreat).
I can imagine the Mienshao/Lopunny (Flashfire) combo.
Tyruntrum's second attack will be used only if there are no special energies in opponent's deck… the first attack can deal same amount of damage without the penalty.
Drapion seems pretty decent. Although its second attack is pretty expensive.
WTH Scrafty again? And once more the stupid attacks. I really hate self-confsing moves.
Clefabale is so weak… only 30 damage. Much less then its “counterpart” Wigglytuff (though in games Clefable seems some stronger)
Klefki: Weak in both attack's damage and HP.
Flygon! I waited for something like this. The super energy accelerator for all types! Not only for grass like Tangrowth Lv. X/Shaymin Lv. X. And it gets even deeper! It's a healer, too. I'm satisfied.
Lickilicky = M Kangaskhan EX without the prize card penalty. (Though weak in both HP and base damage).
Slakoth I can say, it's the worst card ever, since Paras from Jungle. Btw. Vigoroth is much faster then its pre-evo and has 2 retreat whilst Slakoth only has 1. Pretty strange.
I really dislike the loss of resistance in Dragon-types. Noibat -> Noivern; Trapinch -> Vibrava; and no resistance for Dragon types at all. They're naturally resistant against all the basic types (starters even with lightning)… I don't get it. Even worse when they get the new fairy weakness.
Mountain Ring means you don't have to run Mr. Mime's in your deck anymore.
I'm still hoping in special energies for another types in future sets. Psychic would be great; with some effect of confusing or poisoning on touch or something, while fire could burn. Water possibly discarding an energy from opponent's active in a whirlpool; fairy could force your opponent's Pokémon to swap by attaching that energy or so…