Official story and features:
"Near a mercenary stronghold in Crimea, a kingdom on the continent of Tellius, a soldier named Ike rescues a woman he discovers to be the princess of Crimea. She reveals to him that the neighboring Daein kingdom has invaded, and she must travel to Gallia, home to the half-man/half-beast demihumans. War spreads across the continent as Ike and his swords-for-hire fight to protect the princess and confront headlong the racial tensions and prejudices that have torn a rift between humans and demihumans. As they fight, they learn the true reason for the war, as well as the mystery behind the very creation of their divided world."
Story from Nintendo press release
"- Master a world of strategy! Test your tactical prowess against mages, monsters and madmen as you command your knights, pikemen and mounted cavaliers in man-to-man, turn-based combat.
- War takes on new depth! Three-dimensional battlefields present all-new tactical challenges, and graphically stunning battle sequences put you right on the battlefield!
- Bring peace to the land! Take winged soldiers high into the air, or send your furious skinshifters and unleash their feral might on your enemies."
Features from Nintendo press release