"Added: Right-clicking blocks with tablet in hand will now allow components to populate a data table. If any is given, a tablet_use signal is sent to the tablet, with the data passed as a table as the only parameter for the signal. Components providing data are the geolyzer and navigation upgrade for now."
I've tried some test code like this; http://pastebin.com/Jp4yDnMu I do not seem to get any tablet_use signals when clicking on the powered geolyzer. I've also tried registering a event.listen and such. And tried adding a navigation upgrade to a new tablet but got no signals either.