Thanks for the questions, @Edmonds! https://getodk.org/roadmap is where we publish the work we are actively working on or have a rough sense that we'll get to within the next few months.
For items that are not on the roadmap like media hotlinking, the Ideas category is the source of truth. If an idea is open there, it means we (as the core team) don't consider it out of scope but don't have enough confidence in taking it on within the next year to put it on the roadmap. This thread is what we consider the "landing page" for this functionality.
We try to be consistent about giving updates or closing threads as we learn more but we do sometimes get behind so status checks are welcome. It's always helpful to learn what end goals are, for example publishing to Superset in your case.