The Witcher 3: Wild Hunt - Hearts of Stone question

Having finished Witcher 3 with almost 200 hours on record, I am now eagerly waiting for the two main expansions to come out. That aside, I was wondering about reason behind pricing Hearts of Stone at 10 euros and expansion pass at 25 euros. Does that mean second expansion is going to cost more to match the expansion pass cost at 25 euros?

Also now that the dust after the base game launch has settled, I would like to hear your opinions about the game. Also vote and all that good stuff.