If you like to know about Microsoft Windows 8 compatibility of Autodesk products you can visit the Windows 8 Compatibility Center and search for your product.
What does Microsoft say?
Here are a couple of examples:
AutoCAD 2013 is compatible with Windows 8.
Autodesk Revit 2013 is compatible with Windows 8.
But what does Autodesk say?
This is according to TS19048377
You want to know if you can run AutoCAD, AutoCAD LT, or AutoCAD-based vertical products on Microsoft Windows 8.
At this time, Windows® 8 and the Windows® 8 Consumer Preview are not supported operating systems for any AutoCAD versions. The AutoCAD team is investigating compatibility with these new platforms, but we do not have any further information at this time. In the meantime, please refer to Operating system compatibility for AutoCAD and AutoCAD LT for details on currently supported operating systems.
Windows 7 was released July 22, 2009 not a long time after AutoCAD 2010 was released in March 24, 2009. In the case with AutoCAD 2010 Windows 7 became supported by Autodesk. We have to wait and see if Autodesk officially will support some or all of their 2013 products on Windows 8 or not.