What Is Fuji About?
Project Fuji forms the core component of Open ESB v3 effort and represents Sun’s next generation open source integration runtime, focused on providing a lightweight, developer-friendly, and extensible platform for composite application development.
For a great explaination on project Fuji and OpenESB see this presentation (with comments from Andreas Egloff: Lead Architect SOA/BI, [...]
Keith Babo created a screencast giving an early look into IFL incorporated in OpenESB v3. If you try to recreate this simple example in the latest Fuji milestone release you will most likely get an exception when deploying the example.
The exception thrown is similar to
Deployment of service assembly failed. Could not find OSGi bundle for [...]