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The way CU developers revealed the Stealth Mechanics it seem like they were doing more in the department of explaining the lore behind the mechanics rater than the mechanics itself.
the way I read it,
Stealth classes stealth (aka enter viel lore wise)
and certain classes have better Stealth detection skills as well as placed traps that can effect stealthed phased figures. Sounds very similar if not the same as WoW's Hunter vs Rogue combat down to the core.
but maybe there is more to it. Is the Viel really an unique feature that is an original idea on stealth, or is it just lore explaining traditional stealth mechanics?