I was kinda surprised when I looked at the bitrate meter and saw it in the 2's as opposed to the 3's for the audio. I don't know definitively but that seems more like a 20bit than 24bit recording.
Still the audio was impressive.
I just read the review for United 93 on the Hi Def digest web page. Looks very promising! It is being released next week.
I rarely give out 5 star ratings in my reviews, and to be truthful, I'm a little borderline here about the 5.1 English DTS-HD MA track here on 'United 93.' I suppose if we offered a 4.75, I would have opted for that. Caveats aside, 'United 93' features an amazing soundtrack.