If you have recently updated to 4.2 on one of your Nexus devices, you may have noticed that Developer Options is mysteriously missing from the setting menu. After frantically trying to it with no luck, you probably went to the web to find out where it went (just like I did).
To enable Developer Options in Android 4.2, go to Settings->About Phone. Once there click on Build number 7 times.
I'm not sure if this is just the Android team playing a prank on all the developers, or pretty cool Easter Egg. Hats off to the guys over at XDA for finding this.