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From AOL's Black Voices blog:

Sources close to the forthcoming biopic, 'Notorious,' the life story of late rapper The Notorious B.I.G. (real name: Christopher Wallace), tell me that Oscar-nominated actress Angela Bassett ('What's Love Got To Do With It') has been cast to play the late rapper's mother Voletta Wallace. Bassett, who'll next star in 'Tyler Perry's Meet the Browns,' is apparently the first officially person cast in the George Tillman Jr.-directed feature film.

I've requested confirmation on this story. Until I get it, I'd treat it with a degree of suspicion.