Thanks to NBC, we have some spoilery details about those next two episodes.
Grace Gummer and a Ryan Tedder of OneRepublic guest star in the March 26 episode, which is called “The Coup.” Here’s the description of that one from NBC:
GRACE GUMMER AND RYAN TEDDER OF ONEREPUBLIC GUEST STAR – The team deals with the aftermath of the workshop. Ivy (Megan Hilty) remains in the dark about her fate, while Derek (Jack Davenport) recruits Karen (Katharine McPhee) to help him steal the musical from Tom and Julia (Christian Borle and Debra Messing). Eileen (Anjelica Huston) must face up to her ex-husband, Jerry (guest star Michael Cristofer), when their daughter Katie (guest star Grace Gummer) pays a surprise visit from India. Raza Jaffrey, Brian d’Arcy James and Jaime Cepero also star. Grace Gummer, Ryan Tedder of OneRepublic and Michael Cristofer guest star.
Episode 9, airing on April 2, is called “Hell On Earth.” Here’s NBC’s description there:
The team begins their pursuit of a marquee star, as Eileen (Anjelica Huston) charges Tom and Julia (Christian Borle and Debra Messing) with finding a title for the newly reinvigorated musical. Karen (Katharine McPhee) and Ivy (Megan Hilty) find themselves in competition again — this time for an orange juice commercial. Relationship troubles abound, as Frank (Brian d’Arcy James) makes an unwelcome discovery. Jack Davenport, Raza Jaffrey and Jaime Cepero also star.
