"2010: RCA Victor: Nikolaus Harnoncourt, an unusual choice for this Gershwin opera, has recently conducted a new recording of an almost complete Porgy and Bess, which was released in the U.S. in September 2010. Gregg Baker, who sang Crown in the 1985 Metropolitan Opera production, the 1986 Glyndebourne production, the 1989 EMI recording made with the Glyndebourne cast, and in the 1993 television adaptation of that production, repeats his performance here, but the roles of Porgy and Bess are taken by two singers virtually unknown in the U.S., Jonathan Lemalu and Isabelle Kabatu."
http://en.wikipedia.org/wiki/Porgy_and_Bess#Complete_recordings