No, it's not released yet, just publicly announced. Developer preview is planned to be released in the future. Stay tuned for further updates.
Looks like its based on dotty so Java 8 is a requirement.
It's currently based on Scala 2.11 with 2.12 and Dotty support coming in the future.
It is not released. But you can publish it locally.
Compiling the demo-native subproject seems to work. When I try to run it I get a LinkingError though.
Demo reproduction guide to be published in next few days.