Recently, Zachary Quinto mentioned working on other non-science fiction projects and rumor has it that one of those will be a Stephen Spielberg project.
The rumor mill has it that Quinto will play George Gershwin, the composer/pianist who with his brother Ira was responsible for a dozen Broadway musicals as well as popular songs. Gershwin died at the age of 38 of a malignant brain tumor.
According to the rumor, Dreamworks has provided a voice coach for Quinto to help with the Brooklyn accent. Gershwin was born in Brooklyn to Russian parents.
More information will be forthcoming as details emerge.