There's an update at StarWars.com with a first look at the cover for the second Fate of the Jedi novel. It's called Omen (previously Enigma), by Christie Golden, and is due for release in June!
It uses the same stylized design as the previously-revealed cover for the first novel in the series, Outcast (due March 24th), but this time it shows a woman with tattoos and a red lightsaber on the front, who's likely to be some sort of Sith, and a Skywalker Jedi on the back, presumably Luke rather than his teenage son Ben. I like the new look a lot: click here to check it out!