Microsoft Windows 8 and Microsoft Windows Server 2012 are now supported platforms for ColdFusion 10. The new Windows installers are available for download to all retail and licensing customers as well on the trials download page.
Update: For more details on the specific installers for ColdFusion 10 that added support for Windows 8 and Server 2012, see this subsequent blog post, http://blogs.coldfusion.com/post.cfm/cautions-for-configuring-cf-10-with-iis-8-on-windows-2012-server.
The ColdFusion Builder 2.0.1 installers have also been updated to support Windows 8. The existing MAC OS X installer for ColdFusion Builder 2.0.1 has also been certified to now support MAC OS X 10.8.
Refer this technote for more details about the support.