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In principle, I believe that there will be a separate patch for the "veteran" players, just like there was for Heroes 3 back in the day. I think this separate patch will maximize the number of duel-oriented heroes (there are relatively few in version 1.0), and there may be other changes as well.
In general, I believe that all Heroes games had both "veteran" players and regular players. The same applies to Heroes 5.
That's how it is.