0.5.0

• Kotlin Beta 2 support
• Semantic highlighting
• Rename refactoring
• Mark Occurrences
• Extract Variable refactoring
• Navigation to Kotlin standard library sources

0.1.0 Alpha

• Kotlin wizards
• Kotlin perspective
• Building and running Kotlin projects
• Java interoperability
• Code highlighting
• Outline view
• Initial debugging dupport
• Navigate to declaration action
• Basic code completion (Ctrl+Space)
• Auto-import quick-fix
• Run configuration generators for JUnit

http://blog.jetbrains.com/kotlin/2015/03/eclipse-plugin-alpha-is-out/