A number of you (my customers) have asked about the support of BizTalk Server 2006 R2 and the 2008 wave of products (Windows Server, SQL Server, Visual Studio). Most of us expected a service pack release of some sort to update BizTalk to support these platforms; however, it looks like the work involved was substantial and as a result, Steven Martin has announced BizTalk Server 2006 R3 to support these platforms as well as a number of new features. We should see a CTP sometime later this year, with the release taking place in the first half of 2009.
Some of the new features in R3:
For customers who purchased BizTalk Server 2006 R2 under SA or EA, you'll get the upgrade free of charge.
Do we have any idea on when more details will be released?
I don't have any more details, currently... only speculation. I'll post again when I know more.