Future versions of SCS will support refresh of config client. Right now apps only pull config when they start. I believe this feature will be in our next major release (that's tentative and subject to change). Stay tuned to the release notes to see when that becomes is available.
From what I heard, refresh won't be implemented through Spring Cloud Bus though. So yes, you'll be able to sync client's reloading config, but no it won't be using Spring Cloud Bus.
Hope that helps!