Last June, StarWars.com told us
about a new Darth Plagueis novel to be written by James Luceno. If you recall, he was the Sith Lord that old Palpy had to off to gain his power. Well, sadly that book has been canceled.
According to Sue Rostoni's Blog
at StarWars.com, the novel is indeed canceled. We've also confirmed this with Del Rey.
A big thanks to Blacksmith for pointing us towards this.