Apparently Jakku is the desert planet seen in The Force Awakens trailer and players will be able to play out the battle which took before The Force Awakens. In the end of the teaser, we see the Star Destroyer from the trailer chrash. Check out the teaser below,
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Be among the first players to experience the Battle of Jakku*, the pivotal moment when the New Republic confronted key Imperial holdouts on a remote desert planet. Taking place in the aftermath of the Rebel victory in the Battle of Endor, players will experience the events that created the massive, battle-scarred landscape of Jakku shown in Star Wars™: The Force Awakens™.