Confirmed 1.9 Patch Notes

[Icebird]

So, ignore my post here.  The Rogue who got it on test server had Opportunity, which changes to tooltip for Backstab to list 180%.  Apparantly, this new rank of Backstab does nothing.
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I think that's even more impressive than the increased damage to Searing Pain warlocks got.

It's maximum damage increased by 1.

Chris