Oracle (in conjunction with Gartner) proposed a much derided "SOA 2.0" concept based on Event Driven Architecture. Many people think that the future of SOA involves integration with business processes in the form of a dynamic event driven model. However, there are many governance issues with a radically composition and orchestration based model, as there are too many moving parts. Therefore I wouldn't recommend skipping too far ahead, and to try to walk with SOA before you can run.
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