If approved, the Configuration efforts will have to differ a bit I assume.
While an API could probably just stay where it is, both a TCK AND RI will be necessary for that.
No idea, if a JSR could start with API 1.1 or 1.2 or had to be turned back to 1.0-SNAPSHOT before a JSR is Final (most JSRs I know that are new do start at 1.0, the package namespace has to change to something like "javax.config" or similar anyway) but there must be an RI once it is approved as a JSR.
There some implementations out there, so having independent implementations looks not so hard in this case either.
Who knows, if the standard is accepted by the community, even the likes of Dropwizard or Spring might pick it up ;-)
Werner