I just wanted to give everyone a preview of what is coming soon from Jon Brazer Enterprises.
We are in the middle of writing additional material for the Book of the River Nations series. First up is Feats, Spells, and Secret Societies. The Feats section creates two new kinds of Feats: Kingdom Feats and Mass Combat Feats. Kingdom feats are specifically for helping your character be better at ruling a nation. Some examples include: Leadership Role Focus, Inspiring Ruler, Aid Another Leader. Mass Combat Feats are feats that specifically for Unit Leaders to use in Mass Combat (since all other class abilities and feats are not usable in Mass Combat). Additionally there are a number of feats that are common to the River Nations area. Armored Swimmer is the only one I can think of off hand (I'm at the day job ATM).
Spells cover ... spells. Many of the names are still in flux so I'm not going to list any yet, but I can say that there are some that modify a mass combat unit's stats, increase their speed and so on. Also there's a sidebar on using spells like owl's wisdom or bull's strength to modify the ability score you contribute to the kingdom.
Lastly is Organizations and Secret Societies. This describes a number of organizations you might want to promote publicly and secret societies that you want to promote quietly. A short description of each is present along with either an archetype or a prestige class.
Book of the River Nations: Feats, Spells and Secret Societies is expected to be released in Mid-Feb.