A TV reporter posted an Instagram-story of the program from the workshop: Rebecca Naomi Jones is Irene Roth, Ann Harada & Carsen Elrod are the Fodors, Fred Applegate is Everett Baker, Leigh Zimmerman is Tess. Yazbeck, Osnes, Nancy Opel, Harry Groener, and Jerry O'Connell are all still in it!
I guess Riedel's comments about Rachel Dratch and Rachel Bloom were not correct (unless this casting is just for the workshop performances). Great that there's a little more diversity than the Lincoln Center concert, though.