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Thanks for your interest in a new iMovie book. Unfortunately I don't see one currently being planned, but to keep current on upcoming O'Reilly books feel free to sign up for the newsletter here:
Any updates to iMovie since the 10.0 release have not been significant enough to warrant a revision of the book. We do not anticipate considering or publishing a new edition until Apple releases new major version of the software.
Senior Editor, O'Reilly Media