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Certified Guaranty Company (CGC) explains it in this article

A Pikachu V Vivid Voltage Oversized card will be a store promo soon

Tarkir: Dragonstorm releases on April 11, and you can now preorder Play Boosters, Collector Boosters, Commander decks, Bundles, and more from your local game store, online retailers like Amazon, and elsewhere Magic products are sold.

Pushing the impactful cards to higher rarities helps make the games more even-keeled in Limited because of card as-fans (the rate at which a certain card or subset of cards show up within an average booster pack) and in casual Constructed because of card availability