I haven't been able to test it with th SM 3.0 snapshot, only the 2.0.2 release has been tested.
However I think you should not have problems since tests have been made with Open ESB 1.0.3 wich is "supposed" to be JBI compliant.
Maybe you'll could encounter issues with WSDL2 parsing and ant deplyoment, to my knowledge SM 2.0 was not validating components
WSDL2 interfaces, I hope SM 3 is doing it :o). Let me know if you find problems, this has been an hell
to make work WSDL2 Jafs jbi interface on Open ESB :o)