Every article now has a (very basic) GitHub-like issue tracker. Comments now go under issues, and issues go under articles. Issues themselves are very similar to articles, with a title and a body.
This was part of 1.0, but not the first priority, but I did it now anyways because I'm trying to do all the database changes ASAP as I'm not in the mood to write database migrations.
Here's an example:
https://raw.githubusercontent.com/cirosantilli/media/master/OurBigBook_issue_list_on_article_page.png