I purchased EU3 when I heard that HoI3 was being developed to have a look at the engine and interface (which I have to say is a gigantic improvement over HoI2) but there was no mention of missions. I see that this is an In Nominie feature and I'm curious to see how it has been implemented. If it's not too far from what we're describing already then there's a strong hope of it being in the game or at least being able to be introduced later on in an expansion. One of the things I kept in mind when making the mock up image was that it didn't use any new user interface elements that would have to be programmed. It could all be constructed using things we've already seen in the screen shots - not to say that this would necessarily be an easy thing to program, but that's all in Paradox's hands.
Could you elaborate on the EU3:IN system?
The EUIII Missions are nothing as elaborate as you have produced. There are a number of generic Missions, but also country-specific ones. For ex USA can get one of these Missions:
Conquer Florida
Mission: The United States could not keep its hands off Florida.
Acquisition Conditions: Must own a province next to Timucua, but not own Timucua itself.
Success Conditions: Own Sminole and Timucua
Faliure Conditions: None
Reward: 8% Prestige
Relations with France
Mission: The United States needs friends if it is to grow and prosper, we feel that the best option is a solid relationship with France. Let us improve relations with them.
Acquisition Conditions: France must exist, and have relations of less than 150 with the USA
Success Conditions: Increase relations with France above 150
Faliure Conditions: At war with France, or France no longer exists
Reward: -5 Reputation
There is no element of military planning in these. You choose what you want to do to implement the Mission. It is also not the case that you can give a Mission to one of your allies/vassals.