Maybe the models are not even half way finished, as a developer imho its easier to get down to business as soon as you have a semi finished model, to check if it motions correctly while jumping, fighting, etc, having to wait to have the finished models can take precious time, so i dont think we saw the real looks of the game, they already said the quality wasnt maxed atm.

They have the textures of the current game, i dont think they'll trow all away, but lets wait and see how it really looks at release, i dont bother that much if the game turns a bit cartoony because all the glowing and vivid colors, right now the game looks boring.