The Guild Wars 2 blog has been updated with a post by Devon Carver that lays out the details on changes coming in the future for the World vs World system. The team is looking to make 'roles' in WvW more meaningful, siege weapons better utilized and to add more variety to the experience.
Something that has developed naturally over time and that we would like to encourage is the definition of roles within WvW. Everyone has likely seen a commander laying out battle plans and then subsequently seen that one thief mucking up those plans. It’s our goal to introduce more systems that encourage play within a wide variety of roles, not just those two. Scouts, siege masters, and defenders are only a sampling of the roles we intend to add to. We think that these are all a vital part of the success of any server in WvW, so we want to reward players who do these tasks so that they feel like their time is properly valued.
Read the full post on the Guild Wars 2 site.