So, "Deadly Shadow", eh? No breaking of stealth on attacking/manipulating objects? Hiding In Plain Sight? Extra SA dice when attacking from stealth?
What could it be? We will find out eventually, but wild speculation, based on close to nothing, is what makes the Internet tick after all (along with something else we won't mention here).
(from here by the way: http://forums.ddo.com/showthread.php?t=248767)