Save Compatibility:
Everything should work just fine.
New Content:
1. New dialogue and quests, getting the player further into the story.
2. Two new scenes. One with Robin and one with Mia. Overall 7 new animations.
3. A system for basebuilding that will get more content in future updates.
4. The new skill system that let's you earn EXP through combat.
5. A few new backgrounds including much improved forests.
6. About 12 new animations to illustrate how the player interacts with the world. (2 were removed because they didn't look so good.) Meaning that there are overall 19 new animations in this update if you include the scenes.

Content changes: