There's a library that provides Scala-style futures here:

  http://kovenant.komponents.nl/

Although given Kotlin's transparent Java interop you can as well use Guava's ListenableFuture which is quite good, or indeed CompletableFuture (which I like less).

WRT build systems: both Maven and Gradle are fully supported in Kotlin, with JetBrains provided plugins and IntelliJ knows how to work with them. So I am not sure why you would want more here. You say there's a highlighting issue, but I never saw such a thing, and wouldn't that be a minor IDE bug rather than a reason to develop a new build/package manager from scratch?

Finally, Kotlin avoids macros (compiler plugins) by choice. The idea is the built-in features let you customise the language enough without full blown AST rewriting.