Duelists in Japan from October 1st to March 31st will be able to clear missions at events, collect Star Chips, and trade them for exclusive OCG and Rush Duel “Duelist Kingdom” Packs from April 1st to 30th.

The cards for the OCG pack include new alternate artworks of the Charmer series, including Lyna and Dharc. And they come in Secret Rare foil.

No news about about what cards are in the Rush Duel Pack, except it has Supers and Secret Rares.

Existing Missions include:

Participate in Yu-Gi-Oh! OCG Ranking Duel and Yu-Gi-Oh! Rush Duel Tournament Battles

Participate in Yu-Gi-Oh! Day Events for OCG and Rush Duel

Participate in Yu-Gi-Oh! OCG Quick Duel or a new event for Rush Duels

Participate in a “Yu-Gi-Oh! Remote Duel” Event

Acquire a Complete Victory Achievement in Yu-Gi-Oh! Neuron

Acquire a 10 Strong Enemies Achievement in Yu-Gi-Oh! Neuron

Acquire a total of 100 Yu-Gi-Oh! Card Game Points

Acquire a total of 200 Yu-Gi-Oh! Card Game Points

Exchange Yu-Gi-Oh! Card Game Points for Merchandise

Source