Kudos to @uselessend, the producer of the MTG Leaks podcast for turning us onto a graphic revealing two of the foils from the "Duel Decks - Knights vs Dragons." The originally revealed art is "Bogardan Hellkite" and the other deck will feature a Knight of the Reliquary foil as well.

The source from the watermark appears to be GameTrade Magazine but we can't quite read it.

Update: On Feb. 24th, Wizards revealed this image of the Knight of the Reliquary foil from the deck.