There will probably be an offline/ironman game mode that is a one time purchase

Yes only pedometer. iOS has been a walk in the park (no pun intended) since the beginning, Android was a mess until they released the Recording API like 2 weeks ago. Now it’s on the same level as iOS.

Yes, travelling through the world is also done by walking irl. Though obviously the distances aren’t quite 1 to 1. Combat is not implemented yet but coming later. Current plans are that it will be a turn based system and will be what’s called “couch content”, something you can do at home from your couch without having to walk. But all subject to change still.