Im not sure yet, the FC11 build environment is not compatible with mock running under el5 (its the deltarpm system I think), so there will likely be dedicated fedora and/or suse build systems to handle that. The good news is were sort of growing into a distributed build model anyway. It takes a very very long time to build even moderate sized packages on the build server now.
The srpms (which I dont actually build from incidentally!) will not be made generally available. However, the right place to ask that question is via firstname.lastname@example.org
rather than the forums. We are considering allowing OEM type licensing of the technology.