At the end of the Super Smash Bros. 3DS/Wii U Nintendo Direct, both Charizard and Greninja were revealed to be in the lineup.

Charizard has a predictably power-based moveset and it was shown that it's Final Smash will be the Mega Charizard X form from Pokemon X. Greninja on the other hand, is much faster and focuses on swift attacks to damage enemies. It's Final Smash is a flurry of strikes with the full moon as a backdrop.

Both characters are a breath of fresh air, in my opinion, and in the case of Charizard I'm glad to see that it gets to be its own character and not paired up with Pokemon Trainer.