This would be a centralized place where players can check what content is available to them, and a great way to do this would be to have the mission agents "post" on this board that players can see when the intro mission opens up (when they get to a level appropriate to the content). For example, when a player gets to a level appropriate to do Bonnet they could get a mail from the mission agent informing them that Bonnet has been blockaded and that they should report back to earth (or wherever the mission starts) to receive their assignment (mission).