The Windows and Unix versions are now built with JDK 1.6, and the Windows version is bundled with JRE 1.6.0_02. The Mac version is still built with JDK 1.5.
If you want your plugins to be compatible with the Mac version of IDEA, you need to build your plugins with JDK 1.5. A separate ZIP archive is now provided that contains IDEA JARs built with JDK 1.5. You can build against JARs from that archive.
Press highlight usages (Ctrl-Shift-F7) on extends or implements clause.
If someone in EAP happens to use license server you'll need to add -Doldlicenseserver to IDEA VM parameters. We're in process of replacing license server with completely different implementation.
"Inline" can be used on parameters. If all method calls use the same parameter value, it is inlined into the method and the parameter is removed.