It's like I've said. Whatever is coming in VII can't be retconned. Most of the post-ROTJ is likely going to be jettisoned but I imagine they'll slowly start clarifying how much of the old material still stands.
At that recent Del Rey panel the authors there viewed the announcement as a non-event and it hasn't changed the way they write at all.
We just have to wait and see how it all shakes out.