Starwars.com posts a preview of James Luceno’s Dark Lord: The Rise of Darth Vader, which is set immediately post-ROTS:
The Republic has become the Empire, ruled by the wicked Palpatine with order enforced by his new right hand agent, Darth Vader. The galaxy is reeling from civil war and the shocking elimination of the Jedi Knights. Some worlds are resistant to the New Order, and are determined to make a stand against these sweeping new changes.
One of Darth Vader’s first tasks is to snuff out these early embers of resistance, and it is this mission that will lead him to discover his true strength and come into his own as the Emperor’s iron fist.
It comes out in November.
Del Rey is also coming out with an omnibus of the ROTS novelization and Labyrinth of Evil, along with a bonus CD-ROM with a “visual script” and concept art.