Today, Microsoft announces that Windows 8 has been released to manufacturing.
http://windowsteamblog.com/windows/b/bloggingwindows/
We have been testing iScreensaver 4.5 with beta versions of Windows 8 and are happy to report that we have not seen any issues yet.
The final version of Windows 8 will be available to us on August 15th, and at that point we will do more testing and report back regarding issues found, if any.
If you encounter any issues, please post a question to these forums.