Google is running a Television AD (same as video) in the US as well as announcement via Made By Google page that there is a launch event planned for Oct 4th 2016.
With some information on the Made By Google page and clues in the below video it is pretty evident that this is about the launch of rumored Google Pixel phones besides some other device updates.
Google Smartphone Launch Event Oct 4th 2016
Are you curious and excited about what’s coming? Stay tuned on https://madeby.google.com/.