What I expect next is: extend a bpel engine, make it interact with Tuscany's sca binding. Of course any bpel engine might link wsdl naturaly. But in the latter case, we make no improvement to SOA tech. BPEL->SCA should work in a more direct way and more effect way. I think SCA_ClinetAndImplementationModelforBPEL_V100 has specified relevants at section 1.4 .
I open this issue to arouse collaboration from all of you.