The Forza Horizon 4 demo will be available today on Xbox and PC. It does say, however, that the seasons will shift as you play, which is one of the major new features in the main game.
Microsoft also announced that Forza Horizon 4 will be getting a day one auto pack. You can also earn Influence by streaming Horizon 4, and you'll get larger rewards for attracting more viewers. (Note that players must unlock the "Mixer" thread in the Horizon Life campaign to take advantage of Mixer-earned Influence.) Players who stream Forza Horizon 4 on Mixer will earn Influence every two minutes, with a bonus applied for larger audiences. But it will be released alongside a Day One auto pack that might be of interest too. From the ice and snow of winter time to the blazing summer heat, each season has its own charms and challenges. Players will also be able to purchase the Best of Bond Car Pack separately at the global launch of the game.
The Best of Bond Car Pack features 10 cars from the James Bond films, including Goldfinger (1964) and The Man With the Golden Gun (1974), Skyfall (2012), Spectre (2015), and more. Influence is Horizon 4's version of measuring progression, and can be accrued in the main game by exploring, racing, performing stunts, and taking photos. "And that's before you get into the fact that this title will be in Game Pass, which will allow it to reach another set of gamers who may never have played or bought the game".