1.0.1 is almost ready. You are welcome to try 1.0.1 EAP: 1.0.1-rc-11. Changelog (draft) is here.
To use the new builds from Maven or Gradle: add https://dl.bintray.com/kotlin/kotlin-eap as a repository to your project. The EAP build version is 1.0.1-rc-11.
To install the EAP version of the IntelliJ IDEA plugin: open Tools | Kotlin | Configure Kotlin Plugin Updates in the main menu, select the Early Access Preview channel, press the Check for updates now button.