The official Pokémon website has announced a new TCG expansion set XY Fates Collide which will be released on May 2nd, 2016 and will feature over 120 cards.

XY Fates Collide

Reality shifts and is remade in the Pokémon TCG: XY—Fates Collide expansion! Mega Alakazam-EX sees the future—and shapes it to unify two worlds! The Legendary Pokémon Zygarde arrives in many different Formes to bring order, together with Lugia BREAK, Mega Altaria-EX, and Umbreon-EX. Fates are sealed, and two Pokémon worlds join together!

The Pokémon TCG: XY—Fates Collide expansion includes:

• Over 120 cards
• 5 new Pokémon BREAK featuring a recently introduced game mechanic
• 13 new Pokémon-EX, including 3 Mega Evolution Pokémon

Source: http://www.pokemon.com/us/pokemon-tcg/xy-fates-collide/explore-and-watch/