Written by Linehan and his original Father Ted co-writer Arthur Mathews, the show is titled Pope Ted - The Father Ted Musical.
Linehan added: "It's the real final episode of Father Ted."
Promising fans "this is not a drill", he confirmed that music has been composed by Neil Hannon, who previously worked with him to create the score for sitcom The IT Crowd.
Describing the script as "almost written", he quipped "I just thought you'd like to know".
Responding to further fan questioning, Linehan explained: "This is true and not one of my stupid jokes, I promise. Didn't want to do something until the right idea came along. This was the right idea. Arthur and I have been laughing our arses off while writing it. Just like the old days."
Features every episode from the three series of the sitcom following the antics of Father Ted, Father Dougal, Father Jack and Mrs Doyle, and a rather impressive set of extras:
Comedy Connections documentary
Comic Relief with Ted and Dougal
US Interviews with Graham Lineham and Arthur Mathews Tedfest 2007: A Very Ted Weekend
Two Tribes Go To War
Dougal's US pledges
Craggy Island memories
Dougal's favourite memories
Dougal's favourite sound effects
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