The 2012 Nebula Awards were presented May 18, 2013 in a ceremony at SFWA’s 48th Annual Nebula Awards Weekend, held in San Jose CA. Gene Wolfe was honored with the 2012 Damon Knight Grand Master Award for his lifetime contributions and achievements in the field. The winners are:
Novel: 2312 by Kim Stanley Robinson
Novella: After the Fall, Before the Fall, During the Fall by Nancy Kress
Novelette: Close Encounters by Andy Duncan (in The Pottawatomie Giant & Other Stories)
Short Story: Immersion by Aliette de Bodard (in Clarkesworld 6/12)
Andre Norton Award for YA SF-F book: Fair Coin by E.C. Myers
You can see the whole list here on Locus online.