There were a few hotfixes posted earlier this week, on both Monday and Tuesday. On the 29th, both Glorious Conquest Quartermasters took leave from the game for a while. Daxxarri explains in a forum thread that, because Glorious Conquest gear is changing from ilevel 512 to 496, they wanted to remove the vendors before players purchased gear that would end up being a lower ilevel than they bought it for. The change is too big to be implemented via hotfix, so the vendors will be returning with the next major content patch.
The hotfix for yesterday was a nerf to the Lei Shen encounter in the Throne of Thunder for Raid Finder groups. Lei Shen's overall hit points have been reduced by 10%, and the Static Shock effect from the North Conduit now deals only 300,000 damage at zero energy, down from 650,000. That's a big change, and hopefully will make that encounter a little simpler for struggling Raid Finder groups.