Machamp-EX is actually quite good in combination with Dugtrio or another self-inflicting card, and you can prevent the confusion pretty easily with Sparkling Robe. It seems like that could be good.
Virizion looks powerful in theory, especially with 120 for 2. I would've loved to try it with Cofagrigus, but he's rotating out for sure, so that's a no-way. Rescue is actually better than Manaphy, so that seems like it could be strong with decks that play Evolutions. Maybe with Shiftry, hm?
Eh, Celebi is just too luck-based to be any good. It's worse than Chandelure, and even that guy hasn't seen any play, so it just seems like this card is a gimmick.
Doesn't it seem kind of odd that we've already seen 2 Theta Trait cards but both of them are Promos? Same thing with Megas. We've already been shown 4 different EX's, but not a single Mega Evolution. How strange.
I think Ace Trainer is worse than N, obviously, but that's for the better. I hated N because it was expensive, didn't encourage draw-based attacks, and could become deadly with Self-Destruct decks - not to mention the fact that we never got a Shuffle Supporter that outclassed it. Ace Trainer is much more balanced since it can't be used on the first turn, draws a set number so you can't abuse it with like with N in the late-game, and still draws good for you, regardless of how many Prizes YOU have left.