I have just released an interactive storybook for the iPad called Rex The Roach. Its about a robot cockroach who doesn't listen to his mum and gets lost. Rex meets lots of characters trying to find his way home.
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Video of one of the chapters here:
http://www.youtube.com/watch?v=fb9Headcdeg
Available on iTunes:
https://itunes.apple.com/AU/app/id794177982?mt=8
Facebook page:
https://www.facebook.com/rextheroachapp?ref=hl
Spine was great to use. Really speed up development time! The project started with traditional frame by frame drawn animation but switched to Spine during the project. Have still used some traditional animation for turning characters around but Spine supports that too!