Attack on Survey Corps is a game set in Attack on Titan universe. In the game you’ll meet a lot of familiar (and fuckable) characters, quests, and stories to follow.
1. The eatery background’s been redrawn
2. A new story with Mikasa involving training/ combat mini game/ NIGHT SCENE with her
3. The continuation of story with Elsa, a new mini-game with girls. This mini-game will become a proper repeatable thing later on, right now it’s to push the story further.
4. New events with Ymir. To see them, (if you use old saves), go to sleep late at night after you’ve trained with Historia balancing on the ropes.
5. New night scene with Historia (this scene is crucial for Ymir’s branch which will be expanded later on)
6. New main game menu. The girl on the main menu will be changed everytime a new update is out.
7. New collectible event. After you’ve completed the Mirror Man’s event for stealing Mikasa’s panties, go and check the nightstand in your room.
Overall, I suggest you start a new game if you want to see all new events (Ymir/Elsa). However, you can just skip this suggestion for it won’t break your game.
Android users, you should have no problem now updating the game, saves should be transfered automatically.