Yes, there is an $8,000 tax credit included in the bill. However, this ignores that before this bill, there was already a tax credit in place for $7,500. I do not think anyone can say with a straight face that an additional (1 time) tax credit of basically $500 will sway their house buying decision.
I thought the $15,000 credit was good (I thought the language could have been better, but that is not an issue anymore) because it effectively doubled the existing credit, as opposing to barely making any difference.