"If the lack of colour is the most significant feature of a game then that game is going to be pretty weak."
Christ, Ian. This game has hardly been announced. Not even any screenshots have been shown for it. We know next to nothing about the game, so why the fcuk would you assume that's the most significant feature? That doesn't even follow a trail of logic.
They mention it being in black and white, because obviously that's a major part of the game, the visual presentation. But they've also touched on plot, gameplay mechanics, thematic elements, setting, characters, and the style of game it will be. Did you even look at all of that?