If you are interested in future of BizTalk you can view session from World Partner Conference 2011 in Los Angeles by Tony Meleg: AP03 The Future of Middleware and the BizTalk Roadmap

If you have a development practice or you are an ISV and you create complex solutions for customers, you need a number of middleware capabilities at your disposal. BizTalk Server has been at the center of Microsoft’s Middleware platform for a number of years, to provide many of these capabilities. AppFabric, both on-premise and on Windows Azure provides additional capabilities as well as some overlapping ones. So what is the strategy here, what is Microsoft up to long term and short term? How will this affect solutions you create and what opportunities will it create for your company? In this session, you will get the answers to these questions.