All the +threat stances/auras/buffs had an additional 30+% of bonus threat tacked on to everything. So it adds some weight threat wise, to our auto attacks.
Instead of giving the raid the Salv buff and decreasing their threat, they just made the tanks increase their threat out put by roughly the same amount.
Like Defensive stance for a warrior, isn't just 10% increase as listed, it's 10% + the 'salv' mod.
For us, we still have our Giant Holy damage threat increase and now this more universal 'salv' mod threat increase, which applies to all our damage, not just holy.
-edit- I post slow

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-Seraphia <Slap in the Face> : Doomhammer