We don't know but here are the things to consider:
- The graphics are very very good which adds to the immersion of things.
- They promise well-modeled sonar environment in line with the game's sub theme so we can expect realistic detection range.
- They wanted to give us steam workshop but that has now been canceled which is not a good sign as steam workshop would ensure the game's replay value through mods and additional user-created missions.
- They stated there would be direct control of the submarine which I feel is a bit weird as sub isn't exactly a fast-moving aircraft. How this feels exactly in game remains to be seen.
- The rendered distance isn't 1:1 but it's 1:2. I can't see why they don't give us 1:1 distance scale or at least give us the option to play with 1:1 distance scale.
If I got any fact wrong do correct me.
Edit: Sorry I thought you were asking for Cold Waters.
Atlantic Fleet is a good game to me. It's a realistic turn-based surface naval combat simulation / wargame. The only downside is that the graphics aren't too good being ported from mobile game.