I got re-authorisation requests for both of the Google accounts that I have connected to my Nexus 5 yesterday.
I did find it strange as I hadn't changed anything and also hadn't seen any of the usual 'was that you?' alerts that turn up every time I access either of the accounts from an IP address that isn't associated with me by Google.
It sounds more like an inadvertent thing rather than anything suspicious. After all, the powers that be can already read everything that we do on Google and a global hack of Google accounts by other actors would seem unlikely.