#0 - March 31, 2009, 10:12 p.m.
We recently fixed a much publicized rogue bug where the Glyph of Backstab interacted with Dirty Deeds to cause too much damage to stunned targets (basically attacks other than Backstab were benefiting). We were concerned that with this bug fixed, Subtlety rogues would suffer a dps loss. Therefore we changed Sinister Calling to increase the damage bonus to Backstab and Hemorrhage from 5% up to 10% with max ranks.
Edit, I replied with this info, but also editing it in here to get more exposure:
This change is coming in patch 3.1, we have not hotfixed anything at this time.