HBO Harry Potter series release date, where to watch, episode count: When will new show air? Here's trailer, first look, cast updates, Voldemort casting status, production timeline and expanded storylines

HBO Harry Potter series release date is set for Christmas 2026 with eight episodes based on the first book. The show expands storylines, reveals early footage, confirms cast members, and keeps Voldemort casting undecided while production continues with new scenes and flashbacks.

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