All they did was take the badly implemented Samsung 'Auto Network Switch', enable it, and then take the option to disable this 'feature' away from the user. It's not exclusive to the Nexus 10. Pretty much any smartphone running lollipop will switch to data if they can't get a 'stable' connection to Google. Really smart, killing our data plans.
The zero transparency is just dumb. It totally breaks their own guidelines for Material Design.
Also not a big fan of making the notification icons resemble warning lights on a car dash. As if trying to define whatever causes the yellow warning triangle with exclamation point light to come on isn't obscure enough, now they take what used to be a perfect means of diagnosing connectivity over WiFi (hollow for no connection, orange/grey for no connection to Google, blue for internet and Google) and make it even more vague by simply adding a ! To it and not telling us what gives. And they truly thought people were confused about the one used in Jelly Bean? Don't make me laugh.
I'm waiting for them to add in a 'Check Tablet/phone' light. When it comes on time to send it into the store for a super pricey diagnosis and repair.