We've discussed potentially bringing back minor heroes in other forms, but the ones present in the base game caused significant issues, including one where the AI would sometimes build them to the exclusion of everything else.
On an unrelated note, I don’t keep up with all the YouTube videoes, will there be a written post detailing some of the progress being made on 3.0?
While the preview playthroughs are only videos, the actual news posts are always done in both video and article form. Everything we've announced has been included in those, with the broad objectives of the 2.3 changes. There's not like a live tracker of specific things that need to be done, though.