Troy Denning's upcoming Star Wars novel Fury isn't due out for several months (there's still Aaron Allston's Exile and Sacrifice by Karen Traviss to be released first), but the page for the book at amazon.co.uk has what purports to be a basic plot blurb, with somewhat vague but nonetheless potentially major spoilers for the upcoming books.
I can't be sure if this is accurate (there's nothing in it that hasn't been widely speculated by fans already), but here it is:
(highlight to read)
The galaxy is in turmoil due to spreading and incresingly violent civil war - and the Solo/Walker clan is in shock after the horrifying murder of one of it's most beloved members. Jacen Solo, now a full Sith Lord, has seized control of the Galactic Alliance. Luke Skywalker's judgement is clouded by grief, even as he faces his most momentous decision since becoming Grand Master of the Jedi order: whether to support Jacen's illegitimate government against the forces threatening Coruscant...or to join the Rebel Confederacy and take arms against the Galactic Alliance he helped forge.
Needless to say, theories and analysis are already appearing in the relevant thread at TheForce.Net's discussion forum...