Allegiance features music and lyrics by Jay Kuo and book by Marc Acito, Kuo and Lorenzo Thione, with direction by Olivier Award nominee Stafford Arima (London's Ragtime, Off-Broadway's Bare, Carrie, Altar Boyz). Salonga (Miss Saigon) revealed her attachment to the Broadway production in promotional material for her upcoming Café Carlyle engagement.

An official announcement of the production's Broadway plans and casting has not been made.

The musical had its premiere at the The Old Globe last fall. TV actor Telly Leung and film and TV star George Takei (Mr. Sulu of "Star Trek") were among stars of the Old Globe world premiere and were also a part of a recent New York City developmental lab.

The "epic story of family, love and patriotism set during the Japanese American internment of World War II" was billed this way at The Old Globe: "On the 60th anniversary of Pearl Harbor, a meeting with a young journalist forces World War II veteran Sam Kimura [played by Takei, in a dual role later playing a grandfather] to remember his family's relocation from their California farm to the Heart Mountain internment camp in Wyoming. As they struggle to adjust to their new home, Young Sam and his sister Kei [Lea Salonga] find themselves torn between loyalty to their family and allegiance to their country. With its moving score, Allegiance — A New American Musical takes audiences on a journey into our nation's history through the eyes of one American family."

Allegiance has choreography by Andrew Palermo (Ace in regional productions, Kristin Chenoweth at Carnegie Hall and The Frank Loesser Songbook with New York Philharmonic) and music supervision, arrangements and orchestrations by Lynne Shankel (Broadway's Cry-Baby, Off-Broadway's Summer of '42, Vanities, Altar Boyz, Paper Mill's Once On This Island, Off-Broadway's Bare). The Old Globe creative team included 2012 Tony Award winner Donyale Werle (scenic design), Alejo Vietti (costume design), Tony Award winner Howell Binkley (lighting design), Jonathan Deans (sound design), Darrel Maloney (projection design), Jan Gist (dialect coach) Telsey + Company (casting) and Anjee Nero (stage manager). The music director was Laura Bergquist.