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icon of the flag
icons of racial skills and abilities
bio heroes (translation or new ones)
creature descriptions (translation or new ones)
creature balance
possibly rework the cost of buildings/creatures and the creature growth rate.
Instead of tales in the tavern, you can add some information about the history of the faction and recent events in which it participated.
Added 15 minutes ago
WizardNazyr, how about adding beta briefings for each faction in the topic header, like this: It would also be helpful to have a to-do list and a done list for the main details. This way, visitors can see what is being worked on and how it is progressing, and maybe someone can help.
In general, briefings are planned for all factions. But a beta... although, why not. :)
Added 1 hour 13 minutes ago
[Update] Added information about the Nagas, as well as a link to them.