From their announcement:
Start the party early with this stylish Super Dungeon Explore t-shirt, featuring vintage arcade art of the classic Super Dungeon Explore heroes. Our new Super Dungeon Explore shirts were such a big hit at PAX we’re giving you all the chance to get your own.
Shirts will be available to pre-order until April 30th. After the April 30 deadline we will run a batch to order and mail them all out.
Check out SodaPopMiniatures.com for more details and to order yours.