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Another question: While working on the game are you also adding the content from the updates I've been adding to GD4? I'm pretty sure you started working on this around version 4.3.0, which is when the moon came out, but the content I added after that I'm concerned might not be in GD5, like the ability to load GD3 files in 4.4.0, the updated research system from 4.5.0, the 4WO scenario from 4.6.0, the 3D camera from version 4.7.0, the province fixes to make the connections less cursed, the mass production button, the create frontline button, various bug fixes, updated AI behavior, etc...
It's ok if they aren't all in the game, but I feel like if there's too many features in GD4 that aren't in GD5 then it would be more of a variant than an actual successor, kinda like GDH (greater diplomacy hex edition). I'm not saying that's a bad thing though, any modification of GD4 I'm very happy to see, especially if you've worked on it for this long.
Really excited for the release in 6 months!