As announced last month, Kennedy is reprising his role as Curly Watts for live stage show Street of Dreams, which has its premiere at Manchester's M.E.N. Arena later this year.
Bill Roache (Ken Barlow), Katy Cavanagh (Julie Carp), Julie Goodyear (Bet Lynch) and Brian Capron (Richard Hillman) have also signed up, while Paul O'Grady will be hosting.
Kennedy told the Manchester Evening News: "It's big, it's spectacular - that's why it's got to be in an arena setting. It's just a beautiful piece of work and very complimentary to what Coronation Street is all about."
"There's going to be a myriad of big surprises," he continued. "This hasn't just been flung together - it has been thought about and planned for years. I can guarantee you it will be quite, quite spectacular."
Kennedy added that he would love to make a Coronation Street comeback once he has finished work on Street of Dreams.
"It's no secret that I would love to come back to the Street, and it will probably happen at some point," he explained. "I'm lucky that fans seem to really like the character. But I'm just happy for now to be involved in this world premiere and bringing Curly back to Manchester."
Street of Dreams opens in March.
> Coronation Street live musical stage show announced
> Coronation Street musical is brilliant, says Paul O'Grady
> Coronation Street musical is a ten-star show, says Julie Goodyear
> Read the latest Coronation Street news and spoilers
Watch a promo for Coronation Street's Street of Dreams musical below:
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