You_Too said:
When you first look at it you think "Oh, they fixed some of the pink tint and it's less cropped too!" but then if you look closely at the path in the middle:
<img src="http://img685.imageshack.us/img685/970/55962776.png" width="114" height="90" />
See how they made this little part brighter?
Those small changes are enough of a reason to not use the blu-ray for a theatrical HD version.
The whole image is uniformly brighter. That one part is not changed anymore than the rest of the image is.