Microsoft has released a trial version of Team Foundation Server 2012

Visual Studio Team Foundation Server 2012 provides the collaboration hub at the center of our ALM solution that helps teams be more agile, collaborate more effectively, and deliver better software faster. After installation, you can try Team Foundation Server 2012 for up to 90 days.

System Requirements
Supported Operating Systems

Windows 7 SP1 (x86 and x64)
Windows 8 (x86 and x64)
Windows Server 2008 SP2 (x64)
Windows Server 2008 R2 SP1 (x64)
Windows Server 2012 (x64)

Supported Architectures

32-bit (x86) (Windows 7 and Windows 8 clients)
64-bit (x64)

Hardware Requirements

2.2 GHz or faster processor
1 GB RAM – Basic installation
2 GB RAM – Standard installation (no SharePoint)
10 GB RAM – Full installations (includes SharePoint)
8 GB of available hard disk space

Optional Components

Microsoft SQL Server 2008 R2
Windows SharePoint Services 3.0 SP1 or SharePoint 2010

  Team Foundation Server 2012 90 Day Trial