From the publisher's website:
Enter the mystical land of Tian Xia—the Dragon Empires—a new realm for players to explore. Player-friendly descriptions of more than two-dozen nations, new traits for each, details on five new character races (the birdlike tengu, the shapechanging foxlike kitsune, the shadow-wreathed wayang, the reptilian nagaji, and the spirit-bound samsaran), notes on local religions, new Asia-inspired archetypes, feats and martial arts styles, magic items, spells, and a system to track honor and dishonor provide numerous exciting character options.
Each bimonthly 32-page Pathfinder Companion contains several player-focused articles exploring the volume’s theme as well as short articles with innovative new rules for social, magic, religious, and combat-focused characters, as well as traits to better anchor the player to the campaign.