eternalcheechako asked: How can "Duel Decks: Izzet vs. Golgari" be released on 9-7-2012, when RTR isn't being released until 10-5-2012? Have you decided that we can have new cards from a set before the preview weeks for that new set?

Yes, we have.

Duel Decks: Izzet vs. Golgari has six preview cards from Return to Ravnica.