Honestly I think that kind of stuff will be modded a lot, so not sure if Paradox wants to put much time on minor nations focus trees etc.
I think it would be best for them to improve the core of the game, I'm sure they have got lots of ideas and areas they want to spend more time on (as they've said before).
Hope to get some in-depth feelings when playing the nations, so it doesn't feel superficial. I really want to feel like I'm fighting for the Bolsheviks if I'm fighting as Communist USSR.
Something I would be REALLY interested in personally, is a DLC that expands what will happen after Germany is defeated for example, and the allies and Soviets now share a border in Germany. I really was looking forward to the Paradox game
East vs. West, that got cancelled, and it would be nice seeing something relating to that. But as Paradox has said they can't increase the timeline by too far after WW2, because they would then have to change the diplomatic system and a lot more entirely.