I am still waiting to hear back from users, but according to the changelog iBooks Author 2.5 adds an additional layer of security, a better workflow for publishers working with multiple authors, and new templates for making interactive Epubs.
That last detail is of especial interest to readers, so if you get a chance to test it please let us know what you think.
You can find the app in the Mac App Store.
What's New in Version 2.5
- New templates for creating interactive ePub books
- Support for publishing to iBooks using an Apple ID with two-factor authentication enabled
- Improved workflow when publishing books on behalf of multiple sellers
- Performance and stability improvements