Microsoft has released Visual Studio Express 2012 for Windows 8

Microsoft Visual Studio Express 2012 for Windows 8 provides the core tools that are required to build compelling, innovative Windows Metro style apps.

System Requirements
Supported Operating Systems

Windows 8 (x86 and x64)

Supported Architectures

32-bit (x86)
64-bit (x64)

Hardware Requirements

1.6 GHz or faster processor
1 GB of RAM (1.5 GB if running on a virtual machine)
4 GB of available hard disk space
100 MB of available hard disk space (language pack)
5400 RPM hard drive
DirectX 9-capable video card running at 1024 x 768 or higher display resolution

  Visual Studio Express 2012 for Windows 8