JMOD file format is not listed as an open issue?

JEP 261 "The module system" states that the final format of JMOD files is an open issue. However it is not listed as an open issue here: http://openjdk.java.net/projects/jigsaw/spec/issues/ The format of JMOD files doesn't seem to be a part of the spec. Is this going to be resolved before launch? I understand that jimage files are HotSpot proprietary but my understanding was that JMODs were going to be a kind of upgrade to the JAR format and that'd be public.