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At first glance 4.3.1 (left) and 4.4 (right) look the same, but icons for YouTube, Settings, Google Settings, Google and Voice search change. Google+ Photos also pops up in 4.4 while Messenger disappears. And there's the addition of QuickOffice of course.
It's all KitKat upfront, but at least in this preliminary build the OS is still officially called KeyLimePie. It's running on a Nexus 7 2013 edition.
Consistent with the previous leaks, it looks like Google's Android team has put some effort into easier printing from Android devices beginning with KitKat.
Shown above is an option to turn on Cloud Print, presumably the Google service launched earlier this year, which enables print jobs to be sent from tablets, phones and notebooks over the web.