Lost Stars, a 'young adults' book, has been the best new, cannon Star Wars novel to date in my opinion.
There is a rumor now going around now that one of the biggest Zahn Star Wars Characters will appear in Star Wars Rebels season 3, which would make him cannon - Grand Admiral Mitth'raw'nuruodo, i.e. Thrawn. That would huge as he is a fan favorite and is considered the best villain of the post ROTJ non-cannon characters. Of course, if he does make it onto Star Wars Rebels, there will be huge fan pressure on Disney to make Mara Jade canon as she is considered the #1 fan favorite of the Zahn characters. If she or a version of her does make it, it likely would be posthumous though at least respect to the Eposisode VIII and IX. Her character was an ex-imperial, Jedi, Luke Skywalker's wife and the mother of their son, Ben Skywalker. That puts a bullseye on her back when Kylo sacks Luke's Academy potentially leaving Rey as the only survivor.