The PowerShell team recently announced the availability of the WMF 5.0 Production Preview. This is available for:
Windows Server 2012 R2
Windows Server 2012
Windows 2008 R2 SP1
Windows 7 SP1
You’ll need .NET Framework 4.5 installed to run WMF 5.0
NOTE WMF 5.0 PP will NOT load on Windows 10 – as WMF 5.0 PP is effectively the version on Windows 10 plus some bug fixes.
Windows 10 will have an update mechanism when WMF 5.0 is RTM – see http://blogs.msdn.com/b/powershell/archive/2015/08/06/windows-management-framework-wmf-5-0-roadmap.aspx