That's obvious, that they're working off George's treatment, but it doesn't mean they are "disregarding" the EU. Just not basing the movies on it. That we know. We still don't know to what extent the new movies are going to affect earlier published stuff. Also, IMO, it would be stupid for the writers not to use the existing reference material (note I said reference material, not plots or characters). Things like existing starmaps and the technobabble guides (how does a hyperdrive work?) are always going to save them time and work, and they are one "click" away. If they find conflicting sources or existing material that they don't think it "fits", then there is George as the creative consultant to give the final word on it. That's what I think it's the most probable situtation.