Um, yes it does! Win8 Defender now includes Security Essentials.
Here is the official word direct from Microsoft “Windows 8 Release Preview comes with Windows Defender, which has been improved in Windows 8 to provide the same level of malware protection as Microsoft Security Essentials.
Microsoft is actively working with antimalware app developers to ensure the availability of high-quality antimalware apps on Windows 8. If you prefer to use something other than Windows Defender, visit the Antimalware apps for Windows 8 Release Preview page to find out what works with Windows 8 Release Preview.”
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