In short, YES.
Only the 6 films, Clone Wars, Rebels, a couple of Insider short stories, one or two Clone Wars comic books (can't remember which ones) and the new novels are now official "canon".
Sorry, but whatever novels you have read since the Zahn trilogy and up to the release of A New Dawn & Tarkin are no longer part of the official timeline and will not be continued.
Ditto for any comic books (except one or two of the later Clone Wars stories) or games!
Here is a random link from last April stating what happened
On the bright side, Chewie did not die and Planet of Twilight never happened!!