Well, if we assume 650 to be Chespin, and current trends continue to be observed, we will have:
650 - Chespin 651 - Chespin Evo 652 - Chespin 2nd Evo 653 - Fennekin 654 - Fennekin Evo 655 - Fennekin 2nd Evo 656 - Froakie 657 - Froakie Evo 658 - Froakie 2nd Evo 659 - Generic Normal Type 660 - Generic Normal Type Evo 661 - Generic Bird 662 - Generic Bird Evo 663 - Generic Bird 2nd Evo? 664 - Early Route Pokémon 665 - Early Route Pokémon 666 - Early Route Pokémon
So, it's more than likely it will be a random cute Pokémon, with no significance in particular, or an evolution thus.
I would prefer to be known as BlackWaltzTheThird, or just Waltz for short. Official Froakie of the Pokemon X boards.