I think it would be a good idea to have seperate player and GM books. All the players in our group have a copy of the rules, consequently, we all know about the 'bad guys', monsters and special items. This creates a problem for the GM when creating adventures.
Also, extra material would be great. Our group has played everything that has been published by Carl Walmsley and we all agreed that he has a good understanding of the setting, a vivid imagination and a very good writing style. I think he should be put in charge of writing any extra material for Deus Vult.