Exploration, it's always been about exploration in RPG open world games, especially when it comes from CDPROJEKT Red, since from first Witcher game there has been some things you can find in some map corners or edges, which I like, it rewards the exploration. I expect similar if not better exploration experience in their upcoming world, or should I say - city.
Obviously gameplay will remain gameplay, but besides that...checking out what they have done, looking for Easter Eggs, maybe finding Ciri in future that she described when she met Geralt for the first time, that everyone was having their personal ship(vehicles), and other things she describe that was clearly an indication of future, of modern age, so I am not sure if I should hope for it, since it might be an opportunity that flew past developers head to have something like that.
And of course checking other details of city.