Hello Mattis,
There will definately be littoral combat. A lot of the fighting will take place along the Norwegian coastline, so fjords providing cover to subs and patrol boats is a huge part of the game. Narrow fjords will mess with the sonar, and land terrain will provide cover for low flying aircraft over land. How good we could make this at release pretty much depends on the quality of map data we can get on a budget (we have good leads, but help appreciated!).
Obviously, the bigger platforms will prefer to be in the blue sea, so both aspects of naval warfare will be a huge part of the game.
Multiplayer: The terrain itself is kindly provided by mother nature, and it's huge, so it will be easy for us as well as modders to make different scenarios with all sorts of initial conditions for the combattants. That includes everything from sub vs destroyer through CV group vs CV group to large scale war between all the countries involved. We are planning some good attacker vs defender scenarios, both in the campaign and multiplayer.
PS: Very cool picture!