The announcement was done during day one of Grand Prix Indianapolis and was accompanied by a 55-second teaser.
The teaser doesn't show us much but, it sure does leave a lot open for speculation. What has happened to the angels? We worked hard in Avacyn Restored to open the Hellvault and release the angels. Wasn't the balance "restored?" From the looks of this teaser, I would say not.
This has me pretty excited as Innistrad is the block that I came back to Magic in. Will we see werewolves? Will we see Garruk? Will we see some reprints? How about a new Avacyn? I can't wait!
What would you like to see reprinted in Shadows Over Innistrad? List your reprint wishes in the comments below.