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For a list of what has been changed since 5.0.0-beta11, see IzPack 5.0.0 -rc1 RC1 changelog in JIRA.
For a the complete release notes of implemented features, improvements, bugfixes and common tasks in IzPack 5.0.0 see https://jira.codehaus.org/secure/ReleaseNote.jspa?projectId=11707&version=15138.Release Notes - IzPack - Version 5.0.
Although there has been done much work since 5.0.0-beta11, there are still some open issues, and probably there will come some more.
There might be more changes visible in the source code repository, for a complete log of particular changes (experts only) see log on GitHub, where the active development happens.
Apologizes to the fans of IzPack 4 - we know you are out there, but it hasn't been worth to make a new release due to the very few contributions made in this version.
Enjoy this new version 5.0.0 RC1 and keep in touch.
René