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From MSNBC.com:

The role of Notorious B.I.G. for an upcoming biopic on the rapper will be found through an open casting call, the filmís producers told The Associated Press on Thursday.

The still untitled Notorious B.I.G. project, which has been in the works for nearly seven years, will seek its star by auditioning actors and non-actors alike who resemble the rapper, whose real name was Christopher Wallace. Anyone can submit audition videos beginning 3 a.m. (EDT) Sunday to www.foxsearchlight.com/notorious or www.biggiecasting.com.

The article also notes that Antoine Fuqua will not be directing the film.