The Pokémon Company International announced the second English TCG Expansion for Sun and Moon called Guardians Rising on March 21st, 2017 and it was released on May 5th, 2017.

Pokémon TCG: Sun and Moon - Guardians Rising expansion launches 5 May

London, UK — 21 March 2017— The second expansion in the latest Pokémon Trading Card Game series, Sun & Moon—Guardians Rising, will include over 140 cards and will launch in the UK on 5 May. Journey to the Alola region with the Sun & Moon—Guardians Rising expansion. Meet the island guardians Tapu Koko-GX and Tapu Lele-GX, and sharpen your skills with Kahuna Hala and Captain Mallow!

Features of the Sun & Moon—Guardians Rising expansion include:

• More brand-new Pokémon: Many of the exotic and tropical Pokémon that Trainers have come to love in the new Pokémon Sun and Pokémon Moon video games join the Pokémon Trading Card Game, including Lycanroc, Kommo-o, and more!
• New Alolan Pokémon: Regional variants of many classic Pokémon who have a new look in the Alola region will make an appearance!
• Over 140 cards: Sun & Moon—Guardians Rising includes more than 140 cards, including 12 new Pokémon-GX and 3 full-art Supporter cards!
• Introducing the island guardians: These super-powered Pokémon are expected to have a huge impact on the game.
• Two new theme decks: These 60-card preconstructed decks are designed to introduce players to the Pokémon TCG by enabling them to play right away.
• Booster packs: Each pack contains 10 additional cards selected from the expansion.

Lycanroc GX and Tapu Lele GX

Pokémon TCG: Sun & Moon—Guardians Rising Elite Trainer Box

The Pokémon TCG: Sun & Moon Guardians Rising Elite Trainer Box was available in the Pokémon Center and where Pokémon TCG products are sold on May 5th, 2017.

Tap into the greatness of the island guardians of Alola with the Pokémon TCG: Sun & Moon—Guardians Rising Elite Trainer Box. This outstanding collection contains all the tools you need to be ready for your next big battles, including stylish card sleeves featuring Tapu Koko, a player’s guide to the latest expansion, and much more. Compete in Alola style with the Pokémon TCG: Sun & Moon—Guardians Rising Elite Trainer Box.

The Pokémon TCG: Sun & Moon—Guardians Rising Elite Trainer Box includes:

• 8 Pokémon TCG: Sun & Moon—Guardians Rising booster packs
• 65 card sleeves featuring Tapu Koko
• 45 Pokémon TCG Energy cards
• A player’s guide to the Sun & Moon—Guardians Rising expansion
• 6 damage-counter dice
• 1 competition-legal coin-flip die
• 2 acrylic condition markers and 1 acrylic GX marker
• A collector’s box to hold everything, with 4 dividers to keep it organized
• A code card for the Pokémon Trading Card Game Online

Source: https://www.pokemon.com/us/pokemon-tcg/product-gallery/sun-moon-guardians-rising-elite-trainer-box