From the official Japanese Twitter account, the first Level 5 Super Rare. Only 4 SRs remain unrevealed.

Birdramon

Card NumberBT1-017Level4
Card TypeDigimonPlay Cost4
ColorRedEvolution Cost2
Digimon TypeGiant BirdDP4000
AttributeVaccineRarityUncommon
StageAdultArtistTANIMESO
Main Effect[When placed] During this turn, 1 of your Digimon gets <<Security Attack +1>>. (Increase the number of Security this Digimon checks by +1.)
Source Effect

Garudamon

Card NumberBT1-022Level5
Card TypeDigimonPlay Cost7
ColorRedEvolution Cost3
Digimon TypeBird ManDP7000
AttributeVaccineRaritySuper Rare
StagePerfectArtistTANIMESO
Main Effect<<Piercing>> (During the battle this Digimon attacked, and it destroys an opponent’s Digimon, it checks Security.)
Source Effect[During your turn] When this Digimon is blocked, <<1 Draw>>. (Draw 1 card from your deck.)

Booster 1 launches in Japan May 15th, 2020.