Is there a roadmap for the future of CommonMark?
Almost all topics that request new features (tables, unicode bullets, attributes etc.) have been deferred with the statement that the specification has to be stabilized before the new features are considered. At this point it would be helpful to have an idea of when that could happen.
For example, if the roadmap shows that table syntax will be worked on only in 2016, then an implementation might decide to choose one existing syntax and implement that as an extension even if that implies the risk of having to implement another different syntax once the spec gets there.