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Indeed. Remember that EU2 got a whole bunch of patches. Since this is the spiritual EU2 sequel, I doubt it will not get the same treatment :D

But will it receive, "free add-ons", like patches, or will we be forced to buy "expansions" because there was no time to implement stuff in the main game?
 
Only future will tell. If the game goes popular, probably both.
Yes, we will see when time will come and this is not decided at all for now. Anyway, many extra ideas will be implemented for free if we can. Fans for fans! ;)