Great news! After just a few weeks in EAP, IntelliJ IDEA 15.0.3 is officially out. Big thanks to all the contributors, supporters, and, of course, bug reporters.
If you are running IntelliJ IDEA 15.0.2, click Check for Updates and you will get a popup that offers automatic update. Or, you can just do it the good old way by downloading the update from our website, and then installing it manually.
For Kotlin fans we included Beta 4 of Kotlin plugin that (in addition to minor changes to the language and libraries) brings better incremental compilation performance and new coding assistance features. Find more details about it in this and that announcements from official Kotlin blog.