Good grief. I guess I understand the feeling of having been misled, but every game changes throughout development. The reveal was eye-catching in a high-contrast kind of way, but it would likely have been unplayable. As it is, I think it's clear shadows were introduced or drastically improved and lighting in general was tuned for performance and playability. If you're worried about the exact form of the shipping product, you can always wait for reviews of the retail product that include footage.
Dark Souls was brilliant enough that I was willing to take a risk and see what they would do in a sequel. So far I'm pleased, but then I wasn't expecting miracles. These systems are well enough understood that I don't expect developers to wring more performance out of them. All they can do is make trade offs that suit their game, showcase an appropriate artistic style, and deliver solid gameplay. IMHO Dark Souls II delivers on all three counts.