Discussion - Feature is being discussed. Participate by editing the topic. You can simply use the comment field at the bottom.
Accepted - Feature is accepted. Maybe in a modified form after the discussion. We do not yet know who codes it or who when it will be included.
RoadMap - There is a plan for when it will be implemented and someone has volunteered to do it.
Implemented - The feature is implemented and available at least in a snap release.
Rejected - The request is rejected. This state is also used if the feature is already in Motion or it is a duplicate of existing request. KennethLavrsen will always give a reason for rejection.