Here is the Official introducing of the Death Watch in Patch 8 on the 25 May 2004 :
Boba Fett has discovered that an ancient splinter group of Mandalorian mercenaries known as the Death Watch are not just the stuff of myth and rumor but are operating out of a hidden location. Boba Fett's network of spies has also discovered that the Death Watch assassins have contracted a heavy of contingent of the Black Sun to help them in their unknown plans. Are you brave enough to find out what these heinous villains are up to? Work your way through this new adventure zone with over 6 Action packed new quests and unique new crafting missions to find out what has brought these ancient warriors out of hiding !