PowerShell v6.1 preview 3 became available a couple of weeks ago.
To the user its a minor set of fixes from preview 2 though if you read the release notes there’s a lot of work going on in the background.
If the 6 months between releases idea holds we can expect to see the v6.1 release within the next month.
OpenSSH is still a bit of a mess with options to install some, or all, as Windows optional features or install from the github project. This needs to be sorted with definitive guidelines a preferably a roadmap.