Sunset Overdrive for free all day Saturday, according to Microsoft's Major Nelson. Access to the free trial will begin at 12:01AM Eastern Time tonight. It is the "full game" and those who decide to purchase the game later can pick up right where they left off. We've confirmed this will also occur in Europe, but don't have clarification on timing as of posting.
This is a pretty swanky deal to try out Sunset Overdrive, which we gave five stars in our review, saying it "sets out to create a world where the apocalypse is fun instead of depressing." There's no option to preload the demo, so if you're interested in the demo, make sure to set an alarm so it'll be waiting for you come morning.