Pffffft. We're not getting 4.2.2 for another two months! Hopefully less!
Okay, let me explain; In Android 4.2, they introduced the new Quick Settings notification screen. I hope you remember that. Well, it had icons for Wifi, Bluetooth, Brightness, etc. Pressing on any of those would take you to Settings. Now, in 4.2.2, they've made those behave like toggles! So, you can long-press on Wifi to turn wifi on/off as opposed to taking you to Settings.
We've had notification toggles on Samsung phones forever so it's fairly annoying using a stock Nexus phone. You have to go into Settings each and every time you need to turn wifi, bluetooth, mobile data, etc. on or off. I'm glad they fixed that!