Welcome to the community.
I think the Fuse ESB Enterprise is the most fitting forum for talking about Fuse Fabric.
There is also a mailing list for Fuse Fabric
Yes Fuse Fabric leverages OSGi. But as a end-user you do not need to be as exposed to this. For example FAB allows you to develop regular applications using Maven, and then deploy and run inside Fuse Fabric (OSGi container), without you have to know about how to create an OSGi bundle / import|export / and whatnot.
The Fuse ESB Enterprise ships with a number of examples in the /examples directory. They are all non OSGi projects, eg just regular Maven projects. And they are deployed using FAB, which takes care of turning this into the world of OSGi at runtime.
I suggest to read the links on the FAB page
Thanks for your detailed reply which helped me to move one step further.