Searxng/Octet Lin-Manuel Miranda Movie Lin-Manuel Miranda's 'Octet' film begins rehearsals. Star-studded cast includes Amanda Seyfried, Rachel Zegler, Jonathan Groff & more. April 15, 2026 AceShowbiz - Octet is moving forward with its film adaptation, as revealed by Lin-Manuel Miranda on Tuesday morning. The acclaimed creator shared the news on Instagram, unveiling the cast and confirming that rehearsals have begun for the upcoming musical movie.