Update. Although the Atrix is pretty much yesterday's news by now, I'm still really enjoying mine.
It is unlocked, rooted and I am running the Alien v.4 ROM with PowerAMP.
I came across something great tonight.. out of boredom, I put some 24/96 files on my SD card and.. they played flawlessly. ( ! ) PowerAMP shows bit rate and such at the bottom of the player while running. During playback, it displayed, "96.0KHZ 4722KBPS".. I'm not sure how PowerAMP is reading the file data. I converted one of the FLAC's to Wave for testing, but didn't have the same results. The file just wouldn't play.
I don't know if it's the kernal, the ROM or what.. the files play. Sound great. I'm happy.
Just thought I'd let you know. I've included a screen shot if anyone is wondering..

My only fear is that the hardware is down sampling.. :/
Update, again: As I'm sure you can imagin, I've been listening to this album ( in 24/96 ) for a few songs, and can watch my battery level drop.. I did put the Audio Buffer and Audio Thread Priority to max too though. May have something to do with it.
Edited by J.Pocalypse - 3/31/12 at 10:09pm