Release candidate 2 for PowerShell v6 is available for download from – https://github.com/PowerShell/PowerShell/releases
One worrying point is the the OpenSSH implementation which is required for remoting to and from Linux systems doesn’t appear to be any where near a release candidate – https://github.com/PowerShell/Win32-OpenSSH/releases. The latest release as of this writing is 0.0.24.0. The steps to install OpenSSH are still too complicated and time consuming. There is an installation script but it doesn’t complete all of the manual steps!
at the moment I’d really recommend that you only install OpenSSH where you need it and don’t consider it as a replacement for WinRM based remoting apart from a few narrow scenarios:
– Windows <-> Linux remoting
– Cross domain remoting
– Remoting to or from a non-domain system
Ducks need to be lined up if PowerShell v6 is going to GA in January 2018
Richard Siddaway's Blog 
OpenSSH beta version is now included in Windows 10 Fall Creators Update and Windows Server 1709
https://blogs.msdn.microsoft.com/powershell/2017/12/15/using-the-openssh-beta-in-windows-10-fall-creators-update-and-windows-server-1709/
Thanks for the comment. I hadn’t seen the team’s blog post when I wrote my post.
Instructions seem to work for Windows 10 but OpenSSH isn’t found on Windows server 1709 or Windows server Insider build 17035