Android 5.1 has been available to Nexus devices for a little while now, and it looks like one of its neatest features - sorry HD Voice and Device Protection - isn't quite ready for public consumption yet. Thanks to a little bit of sleuthing by Pocketables editor-in-chief John Freml, it looks like you'll eventually be able to log into a Google VPN when you connect to one of those potentially sketchy open WiFI networks out there.