Bttf iPad, update? Or what?

Will back to the future episode 2 be an update on the iPad?
If I buy episode 1 for $6.99 will episode 2 just be an update or do I have to buy them all?
Or will it be a in app purchase for 99 cents or even 1.99?
Any one know?
I just want to know how much i will end up paying to own all 5 episodes for my iPad.

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