The Google Play Store interface for publishers was repeatedly telling me that I needed to design my application, Photog Companion Model Release, for Tablets.
The confusing thing for me was that I already provided alternate layouts for tablets and went to great pains to make sure it worked nicely on tablets.
It turns out, they require the new Layout folders "layout-sw600dp-land" and "layout-sw700dp-land" for compatibility with 7 and 10" tablets. Simply using "layout-xlarge-land" wasn't enough.
Quick and easy fix, just copy the layout I'd already made into the newly created Jellybean specific folders and the warning went away.