zombie84 said:

Trailers don't always represent the final colour grading. If they were fixing the colour issues, it's possible, maybe even likely, that the trailer from a year before its release would not feature this. So, personally, I'm not using that trailer as proof of anything, they probably just used whatever footage was onhand.

I agree. However, that's the only piece of Blu-ray related material that we have. If there is any indication of something, is that nothing has been changed from 2004 based on the trailer. Then again, it's only an indication. Not proof.