The Official Star Wars Blog has posted images of the back covers of two forthcoming Star Wars novels. Click the thumbnails above to see the back cover art, then head over to the post for more information about the books.
Here's what Del Rey's Suvudu blog, which just posted a recap of their NYCC panel, has to say about the back cover art:
"The [Darth Plagueis] back cover features Darth Maul in an exciting action pose painted by artist Torstein Nordstrand. [...] The [Fate of the Jedi: Apocalypse] cover was designed by Ian Keltie and features the engaged couple Jagged Fel and Jedi Jaina Solo."
UPDATE: I forgot to mention that the Suvudu blog post includes a relatively spoiler-free snippet from the Apocalypse manuscript that recently arrived at the Del Rey offices. If you're reading the Fate of the Jedi series, be sure to click through and check it out. The excerpt will absolutely get you pumped for the final installment.