Apple has also changed the behavior of the power button on notebooks. Previously, pressing the button made the Mac instantly go to sleep. Now, just pressing it doesn't do anything. You can still hold the power button for 3 seconds to get the usual "Are you sure you want to shut down your computer now?" dialog box.
Awesome for those of us using FileVault who have to enter their login password each time they wake up their computer.
The parent is correct. In 10.9, pressing the power button put the computer to sleep, replacing the dialog prompt shown in your link. As of 10.9.2, simply pressing it does nothing at all.
Awesome for those of us using FileVault who have to enter their login password each time they wake up their computer.