Before I played the game I was worried about this too, but after I played the beta my concerns were put at ease. The graphics are beautiful and vibrant, I was actually stunned by how great it looked
To be honest, I'm still worried. All videos and images of the levels show the graphics as washed-out subjected to so much bloom that the character models and assets do not look crisp.
--- The Colossal King
--- The Gravity Queen
I think they are old pics that don't represent the game in it's current, much improved state.
It looks the same in the TGS trailer.
I think it's part of the unified art again. Remember how kratos looks funny? or how hatan drake doesn't look like hi former self? well giving the game more washed tones adds a grittiness lost by making dcertain charecters cartoony.