zombie84 said:

The three original audio soundtracks of 1977 should be included, as they are all equally unique and as much a part of the film as it's original image is.

Unfortunately the 70mm Dolby 6-track mix cannot be simply ported over, as the "4.2" Baby Boom configuration is not compatible with modern 5.1 (or 6.1, 7.1) speaker arrangements. The most authentic solution would be to remaster the audio track from the original elements, by merging the two sub channels into one and using a mono surround channel.

I believe this is how the Blade Runner 70mm mix was presented.