I have been experimenting with Kotlin lately, and it's a very simple and comfortable alternative to Java (at least in the scope of programming contests, I cannot find a case where some solution written in Kotlin would be uglier than the Java equivalent). Moreover, Codeforces supports Scala, which also runs on JVM, it's a much more expressive language with more advanced features, although they are useless for the competitive programming context: thus is makes more sense to add Kotlin (also|instead).

I would like to know what people think about it, and if I can contribute anyhow to make it possible, I would like to know as well. Thanks!