The official Pocket Monsters anime site has updated with details on the new anime series Translations follow:

The new Pokémon anime series "Pocket Monsters XY&Z" starts Thursday October 29th at 7pm!

At that point, we will bring you an extravagant one-hour double episode special featuring not only the first episode, but also the XY Special "The Strongest Mega Evolution ~Act IV~"!

At last, the adventures of Satoshi, Pikachu and the others will cross over with Alan's story about Mega Evolution.

The new show "Pocket Monsters XY&Z" will premiere Thursday October 29th at 7pm!

Poster

Story

What secret does the never-before-seen legendary Pokémon Zygarde hide!?
What is this mysterious phenomenon that only happens to Satoshi's Gekkouga!?
What are the goals of Alan and the mysterious organization called the Flare Gang that stand in Satoshi and his friends' way!?
When all these mysteries get cleared up the greatest crisis of all time will befall the Kalos region!

Characters

Picture	Information
	Satoshi and Pikachu: A boy named Satoshi, who dreams of becoming a Pokémon Master, and his partner Pikachu! They are journeying between Pokémon Gyms with the goal of entering the Kalos League.
	Serena: Having discovered her dream of becoming a Pokemon Performer, she's currently challenging the Rookie Class Tripokalons! Her goal is to enter the Master Class! And what she's ultimately aiming for is to become Kalos Queen!
	Citron: The Gym Leader of Miare City! Dreaming of becoming an inventor that brings joy to people and Pokémon, he travels together with Satoshi.
	Eureka: Citron's little sister. Dreaming of becoming a Trainer, she travels together with Satoshi.
	The Rocket Gang: An evil organization that wishes to take over the world. Even in the Kalos region, they aim to get Pikachu, and constantly attack Satoshi and his friends with various schemes! Keep an eye out for these three that persistently get in everyone's way!!
	Alan and Lizardon: A young man who used to be Professor Platane's assistant. He met Fleur-de-lis during his search for Key Stones and Mega Stones. He is currently aiming to become the ultimate Trainer alongside his Lizardon.
	Fleur-de-lis: Director and representative of Fleur-de-lis Labs. An industrialist currently researching whether Mega Evolution energy can be used for peaceful purposes. He gave Alan his Key Stone and Mega Stone in exchange for Alan promising to help him in his research.
	The Flare Gang: A mysterious group searching for Zygarde Core. It appears they are plotting to use the legendary Pokemon Zygarde for something or other, but exactly what that is remains a mystery.
	Zygarde Core Zygarde Cell Zygarde 10% Forme Zygarde 50% Forme Zygarde Perfect Forme Pokémon no one has ever seen before. What kind of role will they play in Satoshi and his friends' adventure!?
	Satoshi Gekkouga

Staff & Cast

Staff:

Executive Director: Kunihiko Yuyama
Director: Tetsuo Yajima
Series Construction: Atsuhiro Tomioka
Character Design: Toshihito Hirooka
Executive Animation Director: Toshihito Hirooka
Art Director: Katsuyoshi Kanemura
Color Keys: Noriyuki Yoshino
Director of Photography: Hisao Shirai
Editor: Toshio Henmi
Music: Shinji Miyazaki
Sound Recording Director: Masafumi Mima

Cast:

Satoshi: Rica Matsumoto
Pikachu: Ikue Ohtani
Serena: Mayuki Makiguchi
Citron: Yuki Kaji
Eureka: Mika Kanai

Musashi: Megumi Hayashibara
Kojiro: Shinichio Miki
Nyarth: Inuko Inuyama
Sonansu: Yuji Ueda

Narration: Unsho Ishizuka

Theme Songs:

Opening Theme: "XY&Z"
Vocals: Satoshi (as voiced by Rica Matsumoto)
Composition: Tomohisa Sako
Lyrics: Tomohisa Sako
Arrangement: Tomohisa Sako, Saku
(SME Records)

Ending Theme:
Coming soon!

Trailer

Source: http://www.tv-tokyo.co.jp/anime/pokemon_xyz/