Sign up for the Unity for Windows Store Apps open beta
Sign up here.
From unity3d.com:
Be one of the first Unity developers to port your content to tablets and PCs running Windows 8 and Windows RT and publish it on Windows Store. As a participant in our open beta for the Unity Windows Store apps port, you get the chance to see how your content will run on this upcoming new global platform, and give feedback for improvements directly to Unity developers.
Looks pretty sweet.
Technorati Tags: Windows,DirectX,Windows SDK,Windows Store app,Unity