Three of the new LEGO Return of the Sith sets have shown up at Sears.com, complete with pictures and descriptions:
Wookie Catamaran (Yoda, Chewbacca, Luminara Unduli, two Clonetroopers, Wookiee Warrior)
Ultimate Lightsaber Duel (Anakin Skywalker, Obi-Wan Kenobi w/light-up lightsabers)
Clone Turbo Tank (Clone Troopers, Battle Droids, Sand Trooper/Clone, Mace Windu with light-up lightsaber)
These pictures along with set descriptions were found at Sears.com, although they cannot yet be ordered.