HBO's reboot of Harry Potter has confirmed John Lithgow as Professor Dumbledore, marking a significant change in casting. Lithgow, a six-time Emmy winner, expressed excitement about the role during an interview. The series aims for a faithful adaptation, planning to cover one book per season over seven seasons, with a premiere expected in late 2026 or early 2027. The casting of other main characters remains unannounced, and the involvement of J.K. Rowling has sparked controversy among fans.