This is a special Pokemon TCG set (has no Booster Box product, features many reprints and is heavily themed) releasing on January 17th.
The set is headlined by Eevee and its Terastallized Evolutions. It also features many Legendary Pokemon (Lugia, Kyogre, Reshiram, Dialga etc.) and fan favorites (Pikachu, Snorlax, Lucario, Mimikyu and more).
Like all special sets, you will not be able to purchase a Booster Box, but instead there will be special boxed products like ETB, a Poster Collection, Tech Sticker Collection, Binder Collection, Mini Tin and ex Box.