No, I'm not talking about the Amazon case, which seems to have come together in a perfect storm of awful timing and disastrous applicability.
I'm talking about World of Warcraft. So far, I've seen two particular bugs. The first is that, if you pay your GP1000 and dual spec your talent tree, your talent trees get terribly confused (though the underlying data seems correct - I can still do a Corpse Explosion, even though the Talent Tree for my DK shows it greyed out).
The second it that, having put my screen into windowed mode, I can't get it out again. Oh, it selects non-windowed in the UI. But it isn't non-windowed, and the moment you go back in, the 'Windowed Mode' tickbox is ticked again.
I expect a bugfix next update day.