Just Cause 2 for Xbox One will be playable by way of backward compatibility, which will be available to everyone starting in November. It's not an updated, high-definition version of the 2010 game.
Microsoft and Bethesda previously partnered for a similar promotion around Fallout 4. Everyone who preorders Fallout 4 on Xbox One gets a free copy of Fallout 3 on Xbox One through backward compatibility. It's unclear if this Just Cause promotion is also limited to preorders.
Also at Gamescom today, Microsoft aired a new trailer for Just Cause 3 called "Burn It." Check it out below.