Of course, even the best of today's Nexus devices shoot photos that are below 16 megapixels in size, so the "unlimited" bit doesn't really help there. However, theydo shoot 4K video, which means that devices owners—at some point—will be able to upload their high-resolution videos to Google Drive without the videos counting against users' storage limits.
And if you want to get really creative, we wonder if you will be able to upload even higher-resolution photos shot with a different device—like a high-end DSLR—if you first transfer them to your Nexus and uploaded them from there. It's a bit of work, sure, but it's also… free.
We'll be curious to see the official rules for Google's new promotion once it goes live.