Hot off the presses... from my inbox:

Stephen Byrd and Alia Jones are proud to announce that the role of “Stella” will be played by two-time Tony Nominee Daphne Rubin-Vega and the role of “Mitch” will be played by Wood Harris, in the upcoming Broadway production of A Streetcar Named Desire directed by Emily Mann. They will join Blair Underwood as “Stanley” and Nicole Ari Parker as “Blanche”. This production is slated to hit the boards, Spring, 2012. Theatre TBA.

So, that just about rounds out the core cast, though there are several other roles in the play.