Bethesda released a teaser trailer to promote gameplay being shown at E3 2015 on June 14, 2015; the trailer depicted the double-barreled shotgun and the Revenant, a monster returning to the game. On June 14, around 15 minutes of gameplay footage were shown at E3. Regarding the progression system, Marty Stratton thought that it was important to allow players personalization and customization.