Apparently at Game Developers Conference di San Francisco will also be present Google, as announced by a very recent video published by the official accounts.

"Come together as we show Google's vision for the future of gaming"

A short message that shows great confidence on the part of Google in what it will reveal. All we can do is wait for the start of GDC which will take place from 18 to 22 next March to find out what will be revealed to us by the Mountain View company.