If you picked up the Rise of the Empire paperback it collects three new short stories. One takes place between Lords of the Sith and Tarkin in 14 BBY (although Mercy Mission says it takes place a year after Lords of the Sith, it is really only "about a year" according to the author and takes place before Tarkin), Bottlenck takes place before A New Dawn, and the last one, The Levers of Power, takes place during the Battle of Endor. They are decent little stories, worth readi
Now that I've had time to get (mostly) through all of the new Journey to the Force Awakens material, I'll make some comments on them. First let's talk about the three character driven young adult novels, Weapon of the Jedi, Moving Target, and Smuggler's Run. I'll sum them up by saying there's not much to them that adds to the Star Wars lore, nothing all that original about them story-wise. However, there are some clues to the new movie in each book that are worth noting.