Most games, unless in the early stages of development where the save system is being affected, will just let you carry over saves between versions by copying over the file containing the save data. In this game, the save appears to be in Streaming Assets, but I'm unsure of this, I see an XML called SaveData01 and I assume that's my save.
Game updates are always the full game, it's just a new version of the game that will have more changes to it depending on what was done in the update. It's patches and DLC that come separate, we are definitely not in the stage of getting DLC yet with the base game still in development.