BizTalk 2006 R2 TAP Beta

You can now apply to join the BizTalk 2006 R2 TAP beta program. During the TAP you get early access to the bits, you need a customer who is willing to participate publicly and you need to involve Microsoft consultants.

Here you can find more information.
http://connect.microsoft.com/site/sitehome.aspx?SiteID=218

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BizTalk Server 2006 R2 will include several new features that will improve connectivity to external Line-Of-Business (LOB) Systems and integrate with Windows Communications Foundation to extend it's support of Web Services.

BizTalk Server 2006 R2 will also include new Microsoft B2B technology for EDI and HIPAA transactions as well as deliver a new RFID Framework and a new BizTalk Server 2006 Workgroup SKU to enable RFID integration.
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My guess is that the BizTalk 2006 R2 beta will probably be public in later beta1, beta2 and RC builds, like the BizTalk 2004 and BizTalk 2006 betas.