Customers will continue to need security solutions even after the advent of Windows 8, and Microsoft is working with antivirus makers in order to ensure that their products will play nice with the next major iteration of the Windows client.

I already told you that the software giant was planning to broaden the Windows vNext terter pool, after I received confirmation from one of the top AV vendors worldwide which was expecting to take the successor of Windows 7 out for a spin this spring.

Part of the Windows 8 testing process will be an Early Engagement event reserved for antivirus makers.
Windows 8 Early Engagement for Antivirus Makers - Softpedia