So riddle me this, Batman: after updating my rMBP to Mavericks, the computer goes to sleep IMMEDIATELY upon hitting the power button. By which I mean, before I even have a chance to lift the button up. The second the key bottoms out, the screen is dark.
What this means is that I am not given any opportunity to "hold the button down" as documented in order to get the dialog box with the shutdown options. I can continue to hold the power button down after the screen goes dark, but if I hold it down long enough, that will only result in the computer being force-powered-off.
Ctrl+Power works as expected, but WhyTF can I not hold down the power button "for 1.5 seconds" as documented to get the dialog box?
-- Nathan
EDIT: Never mind, I figured it out: I'm using KeyRemap4MacBook, and apparently it somehow causes this side-effect. I don't even have a remap specified for the power button and it still causes it to act this way. If I unload it, the power button works as documented. If I leave it running but simply disable all key remaps and tweaks, the power button still instantly makes the machine go to sleep. From the sounds of it, this will be fixed in the Mavericks-only version 9.0.0 due out shortly. In the meantime, I will live with remembering to use Ctrl+Power.