I feel that Disney will not want to alienate certain parts of the Star Wars fanbase. They are a company and alienating certain groups does not help them at all unless the costs outweigh the benefits. This leads me to believe that though indications are that the new movies will be an original story they may not run separate from the EU but concurrently. Maybe these new films will be focusing on some of the other parts on the Star Wars Universe that are not covered in the EU.