Oh my, some of this look positively awesome! I'm loving new witches, very slavic-looking and creepy. Also, if Novigrad turns out like on these concept arts, I'll be one happy player. It gives the impression of being big, rich and interesting - also reminds me strongly of some Gdansk architectre, which is always good.
Hurry up and work on the new renderer, I have high hopes. Seeing all those locations in wonderful TW2-like color palette should be a treat.
EDIT: the tower gives me some strong Tower of the Swallow vibes.