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One more thought, Stellaris is a complete departure from anything that Paradox has done before. HOI4 isn't just their fourth try on WWII, but is more in line with the type of games they're traditionally done.
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But the 1st 3 tries don't give me a lot of optimism. After tremendous excitement over the first two iterations, I never even bought HOI 3 (even though its $10 at GOG right now).
When HOI 4 comes out, the first place I'll look to in the reviews is naval war, especially aircraft carriers. I don't rule out buying it just for the land war if it's really all that and a bag of chips, but as a guy whose first interest in a WW2 sim is playing as the US, HOI has never floated my boat.