While everyone will get the Battle of Jakku DLC for free on December 8, if you pre-order Battlefront, you’ll receive access to the DLC level a week early on December 1.
Set one year after Return of the Jedi, Battle of Jakku takes you to the desert of Jakku, the planet seen in the recent The Force Awakens trailer, In a conversation with IGN, Producer Craig McLeod talked about the content:
This really ties in what we’re doing with the Original Trilogy era with The Force Awakens. The Battle of Jakku takes place a year after the Battle of Endor, and the only way you can experience or see it is in our game. That battle essentially leads to that battle-scarred landscape you see in the trailers.
At the moment, the only post-launch content being talked about right now is Battle of Jakku.
As for that Star Wars Battlefront trailer going live at 10:30am PT today, it sounds as though it will be running on a PS4.
Star Wars Battlefront Release Date Fully Confirmed, Free Battle of Jakku DLC Detailed