Here is what has been revealed in DotP2013 so far:
Augur of Bolas 1U
Creature – Merfolk Wizard (U)
When Augur of Bolas enters the battlefield, look at the top three cards from your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
1/3
Veilborn Ghoul 4B
Creature – Zombie (U)
Veilborn Ghoul can’t block.
Whenever a Swamp enters the battlefield under your control, you may return Veilborn Ghoul from your graveyard to your hand.
4/1
Magmaquake XRR
Instant (R)
Magmaquake deals X damage to each creature without flying and to each planeswalker.
Wit’s End 5BB
Sorcery (R)
Target player discards his or her hand.
Reprint possibly, not 100% confirmed since Mutilate has also shown up with new art
Reckless Brute 2R
Creature – Ogre Warrior (C)
Haste
Reckless Brute attacks each turn if able.
3/1