Microsoft just announced that the Microsoft Commerce Server 2009 R2 March CTP available for download form Microsoft Download Center.
Microsoft Commerce Server 2009 R2 - March 2011 CTP is a pre-release build of the next version of Commerce Server. Please note that this pre-release build is not feature complete.
It is recommended that you install this pre-release on a clean machine and consult the Quick Install Guide for manual steps required.
What's new in this CTP:
- Deployment scripts and sample configurations for two-tier and three-tier deployments
- Support for rich Internet applications (RIA)
- Business data updates to live Web sites
- Multiple orders from a single shopping cart
- Updated solution files and extensions to Visual Studio and SharePoint Designer
Please review the README to understand additional issues that remain in the release and please be sure to post any issues you find to the Connect site.