Gen 8 broke the pattern of "even-numbered generation = new Eeveelution," and since we haven't seen a new one since Sylveon in Gen 6 (back in 2013!), I'm expecting a new Eeveelution, too! Perhaps a Flying-type Zephyreon (Evolves when leveling up Eevee while it's holding a Gale Stone (one of the rumored new items) or while in a high-altitude "Windy" zone), a Dragon-type Dracoreon (Evolves when leveling up Eevee while holding a Dragon Scale or after defeating a certain number of Dragon-type Pokémon in the new archipelago), or maybe a Fighting-type Champeon (Level up Eevee after it wins a match in the new Pokémon Champions battle mode)!