https://www.pcgamer.com/google-teases-its-vision-for-the-future-of-gaming-keynote-at-gdc/

Earlier today we got a look at a patent filing from Google for a controller notification system that will inform users when their online pals are getting up to things. It's all very vague, and in fact Google emphasized that the accompanying illustration is not representative of the actual device, but only intended to provide "a fundamental understanding of the disclosed subject matter and the various ways in which is may be practiced." 

We speculated that the filing might be related to whatever it is that Google is expected to announce during its GDC keynote next week—a keynote that the company is now teasing with a brief new video that is even less informative than the patent filing. There's a stadium tunnel, a backstage hallway, a cavern, a garage, a cargo plane ramp, some kind of fantasy fungus funnel, a spaceship launch bay, and a crumbling castle corridor—the common theme being that each of them are staging areas or portals through which you will step on your way to more interesting places and things.