Kotlin 1.0.4 is here Posted by delgado0 on Thursday September 22, 2016 @12:32PM from the blog.jetbrains.com dept. https://blog.jetbrains.com/kotlin/2016/09/kotlin-1-0-4-is-here/ ( 4 comments | 4 points | on HN )
Considering it the moment it has Netbeans support. Same goes for Ceylon.