The newest iteration of Jelly Bean allows devs to create app content in a variety of pixel densities to allow for the fact that there are a whole range of screen types that run the software.
The Extra Extra High DPI of 480PPI was previously the max, but digging through the code on eagle-eyed developer spotted 640PPI - that's Extra Extra Extra High DPI (or XXXHDPI if you're strapped for time).
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That's Ultra HD territory.
Gives, takes away
Notes in the code add that "Applications should not generally worry about this density; relying on XHIGH graphics being scaled up to it should be sufficient for almost all cases."
So no Ultra HD new new Nexus 7 3 then? So what's the point?
The comments go on to namecheck 4K television screens, which suggests that Google has bigger plans for your TV than just its popular Chromecast peripheral.
Via Android Police