There's a new release of IntelliJ IDEA three times a year. See the highlights of the current release with this list of tips, or see What's New for more detailed information.
Data flow analysis (tip)
Data flow analysis is always being improved to show us potential errors in our logic.
Turn on Preview Features to try new Java features (tip)
The latest versions of Java contain "Preview Features", features that are fully functional but require developer feedback. Try them out in IntelliJ IDEA.