Two decks for the upcoming Magic: The Gathering -- Duels of the Planeswalkers 2013 expansion have been revealed, one of which is based on the RW (Red/White) Boros guild, and the other on the UG (Blue/Green) Simic guild.
The second expansion, if you don't know, serves as the counterpart to the upcoming Gatecrash paper set, and also as the other half to the recently released first Duels expansion, which housed five other guilds, each corresponding to the Return to Ravnica paper set. The other three guild decks to be revealed for this second expansion include BW Orzohv, UB Dimir, and RG Gruul.
So: Boros. This deck is dubbed "Act of War", and like a deck in Duels 2012, features a lot of soldiers, buffing, double strike, haste, lifelink, and first strike. Unlike that deck, there's quite a bit of removal as well. Superstar cards include Lightning Helix, Firemane Angel, and Brightflame.
The Simic deck is named "Sky and Scale", and sports a few cards you may recognize from the "Ancient Depths" deck in Duels 2012, including Coiling Oracle and Simic Sky Swallower. The focus here is pretty different, though: you'll notice a lot of card draw and control, in addition to the fatties; superstars can be found in Murkfiend Liege, Gigantomancer, Draining Whelk, Multani, and Overbeing of Myth.
Hit the source for the full lists (excluding promo unlocks), if you like.
No release date is known for the expansion yet, but going by previous patterns, it can be expected sometime around early January, ahead of the February 1 Gatecrash launch.