Will we get more diplomatic options such as for instance giving the possibility to a Great Power to force an uncivilized nation into opening up their markets?
No, I´m afraid not. The only diplomatic options we have are in the crisis system. Flashpoints are areas where nations own land that either another existing nation feels they have claims on, or where a conquered people want to rise up and rule themselves. Each Flashpoint has a certain Tension level which is affected by how unhappy the people living there are, random events, and a few other factors like the power level of the current owner. Existing non-Great Power nations can also use one of their National Focuses to raise Tensions in areas they have claims on. Once the Tension level gets high enough it triggers a Crisis between the nation that owns the area and the nation that wants it. Both sides need a Great Power to back their cause unless they are GPs themselves or else the Crisis fizzles out, but if both sides get support the Crisis begins.
In a crisis all Great powers on the same continent are invited to express interest or sit it out with a prestige cost. If they join they can then choose to support either side, and the original GP on each side can attempt to bribe the other powers into their camp by offering up War goals against the other camp. A Crisis has a Temperature bar that is constantly increasing, once it reaches 100 the crisis becomes a war, but before that point the leader of either camp can choose to give into the demands of the other to resolve the crisis peacefully.
