I am not sure how the implementation will be done but the implementation of stealth will not be Tarantia Noble specific
Forums, 25th October 2005 (Athelan)
As you might know, Conan was thief in an early part of his career. This has very much inspired us. Not only can the players sneak around, like in most Action RPGs, the thief can climb walls, use physical shadows and to gain advantages to disappear. It is important to know that in Age of Conan – Hyborian Adventures, the player will not be able to “Pop invisible” in front of the NPC’s or other players. He will have to drift into the shadows, using real occlusion to gain the opportunity to hide. In addition, Conan will be the first Online RPG to feature a whole region (almost) exclusively focusing on the Thief and its sub-classes. This region, “Tarantia Noble District”, will include many, many opportunities to sneak, hide, climb, pick-locks, steal, pick-pockets, assassinate, remove traps and sell your loot to other shady characters. It is my belief that Thief sub-classes will return, time and time again, to this trove of sneaky treasure.
MMORPG.com, 14th October 2005 (Gaute Godager)
Note: The thief archtype has been renamed to Rogue.