A link to at least the past 4 years calendar pages (which usually have little things that happened on them, at least for yamatai since I stopped doing it for nep a while ago), links to the active plots/characters wanted pages.
That alongside the 4 factions mentioned in the OP as well as some major setting players (the kuvies, mishu, and maybe the lorath, poku, nesh, and spacers). Who while not really active in some of those instances are considerably large players in the setting
At some point further down maybe a more advanced section for people who want to create in the setting such as links to our (tho im not really in favor of them any more) rules, guidelines, submission rules, the DRv3 page, weapon limitations, templates, etc.