I have hopes for Ben, Allana and Vestara based on the casting list. I feel that they will develop the script independently and then realize there is no reason they can't make them the existing EU characters without much problem. I also assume that even though they haven't read the books in detail, anyone who cares at all about Star Wars has a general idea of many of the EU concepts. The original Zahn novels were likely read by everyone on the project for instance. They've probably dablled here and there in games, comics, novels, conventions, Clone Wars, etc. All of these things have influenced them whether they are admitting it to themselves or not.