The official Japanese Pokémon Card Game website has announced a new expansion pack for Japan called Fusion Arts (フュージョンアーツ) which will be released on September 24th, 2021. The set features a new Battle Style called FUSION. The set will at contain at least 100 cards.

What is "FUSION"?

A Battle Style that incorporates all the styles that exist in the world to create a "new power". Not bound by one set pattern, each battler fights with the moves they have refined and believe to be the strongest.

By using Fusion cards together with the FUSION Battle Style, you can create a synergistic effect that strengthens your Pokémon and weakens your opponent's Pokémon in battle!

Product Details:

Pokémon Card Game Sword & Shield Expansion Pack Fusion Arts
ポケモンカードゲーム ソード＆シールド 拡張パック「フュージョンアーツ」
Release date: September 24th, 2021
Suggested retail price: 165 yen (tax included)
Pack Contents: 5 cards (Cards are randomly enclosed)

Source: https://www.pokemon-card.com/products/s/s8.html