WOTLK has introduced a new stealth enchant into our stealthing arsenal
Enchant Cloak - Shadow Armor
5 sec cast
Runed Titanium Rod
Infinite Dust (20), Greater Cosmic Essence (12), Abyss Crystal
Permanently enchant a cloak to increase stealth slightly and Agility by 10. Requires a level 60 or higher item.
The recipe is sold by Vanessa Sellers in Dalaran and you need to be a level 440 enchanter to cast it.
Unfortunately i can't dig up any info on the effectiveness of the stealth portion of the enchant, but i would assume it to be no powerful then the classic Enchant Cloak - Stealth
For most stealthers we use a low level BOE cloak that we swap out when it's time to fight.
Unless the stealth portion of this enchant is better then the existing enchant i don't see many stealthers taking this option since this enchant looks expensive (at least at the time being)
This enchant looks more suitable to PVPers who need the extra edge in getting the jump over their competition.
For the raiding min/maxers i would expect them to get Enchant Cloak - Major Agility or Enchant Cloak - Greater Speed over this one