Realistic or Arcade game?

In the future, will the game be realistic or will you at least have the option to play it realistically?
By realistic I mean will you have the option to play in the real solar system with real Delta-V numbers, will you have real fuel types, will you have ignitions on the engines, life support, heating and so on?

I have been waiting for a rocket sandbox game with this performance for years. But please don't make a copy of Kerbal Space Program. You can do better.