From the official Japanese Twitter account, the first colorless Digimon, originally revealed in V Jump magazine.

Card NumberBT1-084Level7
Card TypeDigimonPlay Cost15
ColorColorlessEvolution Cost6 (Red & Blue)
Digimon TypeHoly Knight/Royal KnightDP15000
AttributeVaccineRaritySuper Rare
Main Effect[On-evolution] Choose 1 of your opponent’s Digimon. Destroy that Digimon and all of your opponent’s Digimon with the same name as it.
[When it attacks] By returning 1 Level 6 Digimon from this Digimon’s Evolution Sources to your hand, you may make it Active.
Source Effect

Booster 1 will launch in Japan May 15th, 2020.