Awesome. Thanks for the thorough update.
The mountainous regions seams imba: great stone/gold mining bonuses, strong defensive position (looks almost impervious to ground assault), low upgrade costs. Even its supposed weakness is somewhat compensated by the enhanced sheep herding. Although the food penalty (no hunting, no farming) is immense, that's the key I suppose.
Btw, shouldn't it be goats? Goats are th ones who are accustomed to hilly terrain, ship are more like other plains adapted livestock. Maybe I'm wrong. On second thought I probably am.
Will there be trading options? Something like the classical Age of Empires market where you can exchange surplus resources for more needed ones? Or maybe the trading should be done between players?