First off just to get it out of the way I hope there will be some option other than purchasing it on Steam for those of us that do not like Valve and friends.
Personally I hope the game will be more complex. Fields like carrier aviation and the nuclear program really feels like something that could do with an expansion. Yes it would make it more of a niche product but on the other hand it means it will be competing less with Paradox titles and fighting Paradox on their terms is probably not worth it. Also as Slitherine demonstrates with titles like Distant Worlds highly complex titles aimed at a demographic where taste means as much as price you can charge a premium and still sell.
Personally I do not mind paying more if you can deliver a product I like. I bought Distant worlds and its expansions pre-steam and in the end probably paid the equivalent of $150 total. Not saying everyone would do that but not everyone will buy niche games like this anyway and that model definitely appear to work.
For those that do not there are also that thing called sales.
Also please allow more modding options with things like the AI. With highly complex strategy games like this the AI really is critical and with a bit of luck it might be a cheap way to get continual AI improvements. If nothing else it might make the community feel less helpless when something does not work to their liking. Case in point would be the number of people that disliked the casus belli deterioration on lower volatility settings before the latest patch.
Anyway looking forward to seeing what this latest title will be.
I agree with everything Nerei writes.
A good example of what modders can do is the Black ICE mod for Hearts of Iron 3 that basically created a new and far better game .... The same modders might evene make Hearts of Iron 4 worth playing ... allthough I doubt it.
The fact of the matter is that there are a few but very highprofile modders Nerei, Zuikaku, Ruges, mikeownage and Fistalis just to mention a few .... and forgetting a lot ....