I think that there might be a glimmer of hope that they will use some of what is already out there in the EU, or at least not completely ditch what has been written. From this month's Insider interview with Kathleen Kennedy and George Lucas:
Lucas: ...I have story treatments of Episodes VII, VIII and IX and a bunch of other movies and obviously we have hundreds of books and comics, and everything you could possibly imagine. I moved that treasure trove of stories and various things to Kathleen and I have complete confidence that she's going to take them and make great movies.
I didn't read this to say they are completely ditching the EU and will not use any of it. In fact, there was another part from that interview that talks about how Lucas will be there to make sure there is continuity between the new movies and what is already been penned:
Lucas: ...I mean, I can tell you the mythology. That's all my job is, is to be the keeper of the flame, and just make sure that it's consistent...
Kennedy: ...I like to think as we move forward that the fans are on board, they help us, they support what it is we're trying to do. The main thing is to protect the characters and that they still continue to live in the way that George created them. And that the universe of Star Wars continues to grow in ways they can get excited about...
Kennedy: ...These are original stories and original ideas that come out of a world that, essentially, is in George's head. So the beauty of the collaboration that can continue, as we work our way through these scripts, if we're sitting there going, "Hmm... I wonder if this character can do that?" or "Does this make sense within the rules of Star Wars?" I think there's so much that's been written about Star Wars that falls outside of what happened in the movies that he's the keeper of the flame.
So I'll keep my fingers crossed over the next several years hoping they don't completely f-up decades worth of great stories, characters and worlds. Here's to the future of Star Wars, and a hope that its new beginning is as great as it was back in 1977!