Some of the standard library stuff could be usable from Clojure and other languages. The jvm level optimizations (garbage collection) should benefit all jvm languages. The language changes are mostly not that relevant unless you program directly in Java.

I use Kotlin myself (after doing Java since 1995). Most of the overview here reads like they are adding a lot of stuff that Kotlin has had for many years. Structured concurrency, lazy stuff, etc. You can argue about which language does it better/nicer/etc. but that debate is a bit boring to me. But good for Java developers that they are getting some obviously useful things that so far they never had. Progress is nice. Better late than never.