BizTalk Server 2009 is available from 1st May:
http://blogs.msdn.com/biztalk_server_team_blog/archive/2009/04/28/microsoft-announces-general-availability-of-biztalk-server-2009.aspx
Some of the key features of BTS 2009:
Support for the latest platforms from Microsoft including server, Hyper-V, database and development environment(VS 2008.Net).
Enhanced developer productivity and new ALM(application life cycle management) experience for development teams.
New capabilities for implementing agile SOA integration solutions across heterogeneous technologies and Line of Business systems with enhaced LOB adpaters.
New RFID capabilities allows flexible implementation of end-to-end supply chain management and tracking solutions.
Links to new virtual labs using BTS 2009:
http://msdn.microsoft.com/en-us/virtuallabs/aa740373.aspx