Independence Day 2
Genre: Science-Fiction
Directed by: Roland Emmerich
Starring: Will Smith
Release Date: 2014 ?

More Information at: Independence Day 2 Trailer

http://independenceday2movietrailer.blogspot.com/

Bad Boys 3
Genre: Action
Directed by:
Starring: Will Smith, Martin Lawrence
Release Date: TBA 2012

More Information at: Bad Boys 3 Trailer

http://badboys3movietrailer.blogspot.com/

Men in Black 3
Action/Comedy/Science-Fiction
Directed by ?
Starring Will Smith and Tommy Lee Jones ?
Release Date: TBA 2011

More information at: Men in Black 3

http://men-in-black-3-movie-trailer.blogspot.com/

Will Smith comfirmed to Collider (here) that a prequel to I Am Legend is being considered:

I Am Legend

I Am Legend was a great and complete movie by its own. I don’t think that a sequel to I Am Legend would do good… People would go see the movie sequel, no doubt, but they would most likely come disappointed from it because it would never fit with the vision they may have built of what may have happened before I Am Legend…
:-/

Hancock 2
Action/Comedy/Sci-Fi
Directed by: ?
Starring: Will Smith
Release Date: TBA 2012 ?

More information at: Hancock 2 Trailer

http://hancock-2-movie-trailer.blogspot.com/

Seven Pounds
Drama
Directed by Gabriele Muccino
Starring Will Smith, Rosario Dawson, Woody Harrelson, Michael Ealy
Release Date: December 19, 2008

More details at: Seven Pounds Trailer

http://seven-pounds–trailer.blogspot.com/

Hancock
Action/Comedy
Directed by Peter Berg
Starring Will Smith, Charlize Theron, Jason Bateman
Release Date: July 2, 2008

More Information at:
http://hancock–trailer.blogspot.com/

Hancock

I Am Legend
Action/Thriller
Directed by Francis Lawrence
Starring Will Smith, Alice Braga, Salli Richardson-Whitfield, Willow Smith, Charlie Tahan
Release Date: December 14, 2007

More Information at: I Am Legend

http://i-am-legend-trailer.blogspot.com