A currently unknown Marvel project has been slated for July 8th, 2016. This film would be in Phase Three of Marvel's Beloved Cinematic Universe.
I'm thinking if any of these guesses are correct, it's going to be Dr. Strange. Anticipation levels have steadily been building and massive spoilers have been leaked all over the Internet.
This is probably the most unlikely of all of these. A Black Widow movie is still a possibility in 2016, but the chances are very, very slim. A source close to Marvel once said that they would love to see a stand alone Black Widow film, but also said that The Avengers comes first. What could really make a Black Widow interesting is her teaming up with Hawkeye and finding out what really happened in Budapest, which was mentioned in The Avengers.
The first Thor film was released in 2011. Thor: The Dark World comes out this November. If it does well, doing more business than the first one, a third installment is likely. Or maybe Thor: The Dark World will be the last we see of Thor until The Avengers 2 and 3, due in theaters May 1st, 2015 and sometime in 2018, respectively..so mark your calendars!
A few years back Marvel hired Mark Bailey to write a Black Panther movie. That script will soon be rewritten if a film is in the works. I would suggest Black Panther having a cameo in another Marvel film before getting his own stand a lone movie. That could increase demand and box office numbers.
What is this mystery project? What do you want it to be? Shout it out in the comments section below.