Quote: “Once SQL Server 2008 (…) becomes generally available, we will follow with an updated version of BizTalk Server designed for the latest versions of Windows Server, the .NET Framework, Visual Studio, and SQL Server.   This will mean that BizTalk Server customers will continue to take full advantage of the platform’s latest improvements including: scalability for mission-critical workloads, improved support for next-generation web and service oriented applications, improved virtualization support and better business insight through Office.”

http://blogs.msdn.com/stevemar/archive/2008/04/23/biztalk-server-platform-updates.aspx