You have to look at two things when examining this games potential.
Firstly, the developer. Witcher 3. I mean, Blood and Wine, what more can be said. It was such a quality game and more importantly, a memorable experience. And its a single player game!
2nd, it has been in development for 7 + years. It could be a bad thing in some cases, but with this one, I believe CDP Red has done enough to earn our respect and patience. There is no reason to think all that development time has been for naught. This game looks to have incredible UI design along with an awesome setting and atmosphere. If the itemization is good? (better than The Witcher 3) You have a home run IMO. Im not worried about the plot direction, if the level progression is varied and meaningful, and if the spread of dropped/crafted items is vast enough to keep you wanting more (think Borderlands but not as extreme) I dont see how this game can be mediocre nevermind bad.