WMI team created a useful cheat sheet summarizing what's new in WMI. This is a great reference doc for developers. We are making them available through this blog post - as is.
The real documentation is still on MSDN (and it is being regularly updated). Cheat sheets are just a quick reference to get people started.
Some other useful links
WMI – MI API docs on MSDN
MSDN location of the new WMI Management Infrastructure API documentation.
MI API Samples
WMF 3.0 download
Download the Windows Management Framework. Contains WMI, WS-Man & PowerShell updates from Win8. Applies to WinSrv2008, 2008R2, and Win7.
CIM IDE download
CIM IDE tool is a Visual Studio snap-in used to build WMI providers & CDXML.
Thanks to Keith Bankston, lead WMI PM , for authoring this this cheat sheet and sharing with community.