No, they're Dogs of War with some Border Princes regions. Border Princes is a place, like Tilea, and it's never had an armybook of its own. What has been an armybook is Dogs of War, which is mercenaries used heavily in regions like Tilea and the Border Princes.
Yep, and they're pretty cool.
Yeah, Wood Elf units are generally crap in defense, except for the Forest Spirits. They're a shooting army. The newer style shield carrying versions have the armor and stats to match High Elf Spearmen. We'll test out if they'd be better like that, but it's pretty fun having the WE units glass cannons.