This is fantastic news!! (Yeah, I know it's not "news" anymore, I managed to miss it somehow ...)
As a paradox / game fanatic, C++/C# programmer & software developer it would be a dream come true to participate in this
I can think of a number of cool features to add to any of the games:
* AAR support (event & timeline data, perhaps tag important leaders, units, countries etc and get logs of their doings, attach notes on objects during the game)
* Events engine expanded to contain events for more game objects (units, leaders, research, COTs, whatever). Allows smaller events to affect the course of history. More dynamic event system (perhaps more like eu3).
E.g. freak discovery during research can give boost to other research or production. Heroic battle results in boost of country happiness. New advancements might change resource type / amount in some provinces.
* units/provinces/buildings/... have histories -> easier to build dynamic events that make sense
* Story-driven scenarios (smaller scenarios, lots of events and more intense)
* New ways to play the game:
Duel mode: Nations are compared for points / glory / whatever.
Challenge play: Set own goals (explicitly ingame) and try to achieve them, while the computer / opponents try to make it harder to achieve them
* UI Enhancements: Alerts, advisors, more unique info on stuff
* Possibility of increased micromanagement combined with automation of features (e.g. more advanced research, but can be (partially) left to advisors)
* More dynamic unit / leader stats
That's just some of the wild ideas that popped into my head ...
I don't care about making any money on this, I'd be in it for the fun and challenge to create something that people will love to play!