Skype for Windows now supports the Windows 8 Developer Preview.
The change was made as part of a new product update – Skype 220.127.116.11.
The text from the site is:
Today we have released an update to Skype 5.5 for Windows.
With this update we have introduced support for Microsoft Windows 8.
Upgrade Skype now.
We are always interested to hear your feedback on Skype, so please discuss your views on our Support Network and report issues on our public issue tracker, see the guide for issue reporting.
Full release notes for 18.104.22.168 are:
Introduced Microsoft Windows 8 support