"Players that have met the criteria for the free game will receive an email after Jan 15 with instructions for how to access their free copy in the weeks following the end of the Project Stream test".
Google's Project Stream is - in theory - going to let you stream the latest and greatest in videogames to your Chrome browser, with all the computational heavy lifting handled remotely on a server.
If I'm not mistaken, Google's Project Stream is now available to all USA gamers (you must be 17 years or older and live in the U.S.to participate).
Once you sign up, you'll be able to play Assassin's Creed: Origins for free via the stream, and partner Ubisoft is giving all participants 1,000 Helix credits just for trying it out. It doesn't matter if you've played over an hour in the past, and to get the free copy you need to log an additional hour of playtime.which shouldn't be hard to do in Ubisoft's vibrant and massive open world. You'll need to clock in a minimum of one hour played before January 15 to receive your Uplay copy.
Your save data and items - both earned and purchased - will transfer over to the Uplay copy, but unspent credits won't.