Better boss fights if its going to be some huge monster then it should move around, try harder to kill you, and be adaptive the huge octopus wasn't an epic boss fight just a large, repetitive, lumbering one.
Fast travel that doesn't require me to find a fire, a rail line, or other such place if I want to fast travel I'd liked to just pull up my map select the area I've been to and want to revisit and hit A to go there.
A horse that controls like red dead redemption you can fight on it its responsive ect. And an indestructible one nothing is worse then being over burdened with loot and my horse went and got itself killed. Also horse running off in battle while practical have it come back on its own after the battle is over I don't want to have to hunt it down!
Regis and Malvia in game recruitable and squadmate that will hunt the monster with you if you invite them. Also keeping the repore between these two characters and Geralt.
Fairs that vary in the ingame calendar. I liked how skyrim had an imaginary calendar yet I wish there were festivals and different things happening in towns. Bioshock infinite did a great job in a festival theme you got to play unique games and they were lively. However each town who hold a festival should have at least 2 things different in their games so its not repetitive and each town holds these different calendar days according to their own dates. So for instance not all cities have a harvest celebration on the same day only 2 or 3 towns will hold this event during a weeks time. Different decorations, different games, our npcs will react to it maybe even share memories if they have them. If the game let us continue to play after we beat it the calendar activities still hold so its not boring.
Weather I like weather changes so leaves change for fall, lots more rain in spring, snow in winter, ect
Clothing! In TW2 I was sooo pauper in that game until I found that enchanted armor then I ware that all game and I hate it! Sure people will say its not a fashion game but honestly I'd like to be able to buy things that coordinate, match, and look cool based on the money I save, craft the items, get on quest, and all three. One of the reasons I like fable is I can buy alot of clothing and change my appearance. Also when we're shopping for clothing either show Geralt demoing the look or go like Skyrim and show us a clear representation of what the clothing look like.
More variety in our squadmates lines when not on main quest it was really annoying in TW2 as I kept returning to my group they'd all talk about the same things aka stuck on repeat and it sucked. Talk to me with variety of topics like in DA and allow me to have a personal wheel choice conversation with them.