If you buy any Leanpub book, you will get all updates to the book for free.

If the book is incomplete and you would like to contact the author and ask them if they have a publishing schedule, here is an article from our Help Center that explains how to do that:

http://help.leanpub.com/en/articles/3852119-how-can-i-contact-a-leanpub-author

After you buy a book, you can always download the latest version from your Leanpub library here:

https://leanpub.com/user_dashboard/library