Ever since Rocksteady Studios wrapped up their acclaimed Arkham series with, rumors have been circulating that the video game developer was working on a top-secret DC project, which many have speculated is a game based on either Superman or the Justice League.Despite the demand, the developer has remained absolutely radio silent on their next venture. However, a new leak seems to suggest that they may finally be ready to debut the game at E3 next weekend.The leak originates from 4chan ( via ComicBook ) and claims that the game will officially be announced this week when Game Informer unveils their July cover. Rocksteady will then debut the first gameplay footage next Sunday, during Microsoft's E3 conference, which begins at 4:00 p.m. EST.It's not entirely clear what we'll see, but it sounds like it'll be a reveal trailer that showcases Brainiac's invasion of Earth and Superman being weakened from battle. Gameplay footage will demonstrate the flying controls and the new combat system as Superman battles Brainiac drones both on the ground and in the sky.To add more fuel to the fire, a new website, supermangame.com , has gone