User blog:GeigerJJr/Mystery MCU Project

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So I was just reading the bottom of the Earth-199999 page, and it mentions an unnamed film to be released May 16, 2014. What are people's thoughts on who/what that particular release will feature? Could it be misinformation to build hype for a highly probable Black Widow or Hawkeye stand-alone, or could it be something that can't be officially disclosed (a home-coming if you will for the FF, X-Men, etc.)?