Microsoft has released a trial version of Visual Studio Ultimate 2012

Visual Studio Ultimate 2012 is the comprehensive ALM offering for organizations developing and operating highly scalable software applications and services. After installation, you can try Ultimate 2012 for up to 30 days. You can extend your trial period to 90 days by registering to obtain a free trial product key.

System Requirements
Supported Operating Systems

Windows 7 SP1 (x86 and x64)
Windows 8 (x86 and x64)
Windows Server 2008 R2 SP1 (x64)
Windows Server 2012 (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)
10 GB of available hard disk space
600 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 Ultimate 2012 90 Day Trial