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The settings icon has changed from 4.3, and in this version Google looks to have implemented a Tap and Pay feature. Exactly what Google has here isn't known yet, but it would appear to suggest better support for NFC-based payments. Interestingly, Google recently opened up Google Wallet to all Android devices running 2.3 or higher, even on hardware without NFC support.
NFC payments built-in to KitKat?
Google's Tap and Pay isn't enabled here so it's hard to say if it's working or not.
K for KitKat
This one is odd. The Android version screen looks nothing like the recent Key Lime Pie leak from Gadget Helpline, while the background is the same as Jelly Bean 4.3, but obviously there's a big K there.