On the TIOBE Index for June 2017 Kotlin makes it to position 43 and gets some special mentioning in the first paragraph:
As of Android Studio 3.0 there is full Kotlin support. Kotlin has been developed by JetBrains, the company that is known for its very popular programming environments. Just like languages such as Scala, Clojure and Groovy, Kotlin compiles to JVM code, thus being compatible with Java programs. The mixture of expressive power and compilation speed might be the key features of Kotlin to succeed. Apart from Kotlin, Hack and Rust are moving up in the top 50 as well.