skyjedi2005 said:

I was surprised that according to a review they actually bothered to include the 35mm mix in 2.0 on the blu ray of the theatrical cut, i don't have a blu ray player and have no way of knowing if the 5.1 is another new mix or the 70mm mix which all have been waiting years to hear again.

As far as I can tell, the 5.1 mix is just a lossless version of the 5.1 mix from the previous Theatrical Cut DVD.

The 2.0 mix was on the replacement discs of that DVD as well (after fans complained), so I would have been more surprised if WB decided to leave it off.