This new release comes with a bunch of exciting new features both for users and for administrators. This are just some of the new JIRA features that you can find in this release (the following list is an excerpt of Atlassian JIRA v. 4.3 Release Notes):
- Revamped user management and full LDAP integration.
- New Plugin Management System.
- In-place JIRA upgrade.
- Improved search capabilities.
- Support for Google Chrome and Safari 5.
Part I - Full LDAP Integration
Part II - In-Place Database Upgrades
Nevertheless, the best thing you can do and the quickest way to discover what's new in the latest JIRA is checking it out yourself: download JIRA and get started.