This whitepaper from Eset, focuses on the following areas of Windows 8ís security features based on the interest we have seen from our customers and in the security community:

◾Windows Defender
◾The Unified Extensible Firmware Interface (UEFI) and Secure Boot
◾Early Launch Anti Malware (ELAM)
◾Potential attacks on Windows 8.

You can download it from here.

Additional read: New security features introduced in Windows 8