From the info we got from gametradersseaford.com.au, the Hybrid Digimon like Susanoomon and EmperorGreymon from Digimon Frontier anime are included in this BT7 booster box. And the tamer character Takuya Kanbara and Zoe Orimoto also made it first appearance in Digimon Card Game this time.
From the same source, we may have DOUBLE BOX TOPPER PROMOTION : Each booster box contains AA art of Tamer and English version exclusive alternative art of SR option card box toppers. (Since these are info for English BT7 version, for Japanese cards we will confirm later when we have correct info.)
DIGIMON ADVENTURE (2020) CAMPAIGN RARES: Eight new “Campaign Rare” cards based on characters from the Digimon Adventure (2020) make a special appearance
GOLDEN ALTERNATIVE ART DESIGNS: Alternative art cards feature a glorious golden design