As you can see, the above trailer heavily features Clemont, the Lumiose City Gym Leader, and his sister Bonnie (sidenote: her Japanese name is Eureka to go with the inventor theme). The female character from the Pokémon X & Y games, Serena, also makes an appearance! Looks like the series will start with a bang!
Pokémon the Series: XY Episode List (Translated)
We’ve Arrived in the Kalos Region! The Beginning of Dreams and Adventure!!