Looking at the details, it looks like getting it to see and play files off the empeg Mark II may be possible. According to Fresh Gear, it scans the network for windows shares and looks inside them for MP3's. To get it to see the Mark II, Samba could be run on the unit, and from there it can look at the files. (A few minor issues exist here, but should be resolvable if someone tries this.) Or, since it was indicated that Shoutcast support will probably be possible on the Mark II, just stream to the AudioTron, and use the empeg for music control.
Either way, it looks like a nice product from Turtle Beach, and the Mark II can complement it.
Also, it probably runs WinCE for ease of finding windows shares, and also HomePNA support. These would probably be possible in Linux, but this brings up the fact that it really dosen't matter what OS an embedded system uses as long as it works well.