Like all V Boxes, it’ll come with a promo card, jumbo card, and four booster packs.
The box itself hasn’t been revealed yet, but PTCGO recently revealed the Pikachu V promo. It’s SWSH198.
This Pikachu V comes from Start Deck 100. Those decks have 35 brand new cards, 19 alternate art reprints, and 10 secret rares. So it seems TPCi will release some of the notable cards as promos and throw the rest into a future set.