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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.
Design changes in store
On the left is the clock in Android Jelly Bean 4.3.1. On the right is KitKat's clock, which is more balanced than Jelly Bean. Besides toning down the hour font, the alarm clock migrates from the bottom in of the screen to the top left in KitKat.
QuickOffice in KitKat
Here's QuickOffice implemented in KitKat. It makes sense to ship the app with Android, given that Google made it free last month and with Android can ramp up its user numbers and keep Microsoft Office on the outer.