For those of us on Steam, the release of
X3: Terran Conflict 2.0 - The Aldrin Missions was virtually unnoticeable. That was, of course, until you read the patch notes. Along with a slew of bug and issue fixes, they added several new missions. For those who have the boxed sets, you needn't panic. You can download the update to 2.0 online, and of course, it contains the new content.