This game looks damn revolutionary, being the first real medieval non fantasy RPG ever (Mount and Blade does not count), based on historical fact, from the story to its world, to its combat.
This game can make the entire industry look at RPGs differently, because simply put, you cannot play this game like a normal RPG. In KCD, you will never become a super warrior, you will never find phat loot that powers you through the game, your fighting skill matters just as much as you loadout (and sometimes avoiding fights is better), and you have to plan for everything or you will die. You will not be able to slash through plate armor with a sword unlike most RPGs. Bows are some of the deadliest weapons in the game. As well, armor can not only slow you down, but helmets obscure your vision. Food rots, weapon and armor breaks, and there is actually a skill to read. There are no reliance on map markers or special senses either, this game does not hold your hand and expects you to figure things out yourself.
The immersive sim aspects look to be ambitious as well. People become suspicious after you steal from them, so much so that it is a bad idea to sell an item you just stole In the area. People react to what you are wearing and if you are dirty and bloody. You can disguise yourself as well. Quests have multiple solutions and outcomes, more so than say, the Witcher 3. And people will not wait for you, if you go off and explore and do other quests, they can leave without you and even complete the quest themselves. Fast travel can also be interrupted by ambushes and events.
Yet, the game sites aren't hyping it much weeks before release. its a kind of game that seems to me that critics will nitpick and underscore, but gamers will consider later (if they do not have some blunder we don't know about), a cult classic that will impact the RPG genre going forward.