If you've already joined IntelliJ IDEA 14 EAP, grab the freshly baked build that we published just now. If you haven't, it's a perfect time to do so now.
The most notable change in the new build is a built-in decompiler for Java classes. Now you don't need any third-party plugins to take a look at what's inside a library for which you don't have the source code. This might not always work for Java 8 and non-Java classes, but we're working on making it better and your feedback is always appreciated.
Other interesting things to try out:
Windows installer with bundled JRE uses Java