Well, I think he's saying (Tom, correct me if I'm wrong) that if you have a 4.7 ESB configuration, it'll work in 4.8 or 4.9 just fine. The JBoss Tools Galileo tooling will allow you to create a 4.7 compatible configuration, which should work on an ESB 4.8 runtime.
Are you adding any 4.8-specific features to your configuration?