Ahead of the game's probable appearance at Summer Game Fest, the release date and tons of content for Sega's upcoming Sonic X Shadow Generations have been leaked online. Sonic X Shadow Generations is the updated re-release of the 2011 Sonic Generations, remastering the original game with improved graphics and framerate, along with adding a brand-new story campaign focused on Shadow the Hedgehog, who has been added as an additional playable character.