In a nutshell, the flattening process supports a wider variety of scenarios. Please head over to the Changelog for details.
This is a bug fix only release, as no new features have been added.
Having said that, we'd also like to point you to a couple of XFA-related blog posts that may be interesting to you:
- Flattening XFA causes layout issues in certain documents
- Fix choice subform set handling when direct child has no binding
- Date is not taken into account when applying form state
- List coming from rich text (HTML data) is missing after flattening
Examples (latest ones)
FAQ (latest ones)