A new version of McAfee VirusScan for Mac has been released, and this appears to allow the software to be installed on OS X 10.7 Lion based on initial reports. Please note, however, that officially, McAfee does not support any operating system until at least 30 days after its official release and therefore Lion is not officially supported or even mentioned in the documentation so be aware of possible compatibility issues.
For more information on the new features and how to use the product, you can view the release notes here.
Duke faculty, staff, and students may download the software for free here. If you have a previous version installed, it will automatically overwrite it.