[Chris Harlan] "Yes, I would definitely like to hear what anyone has to say about audio handling."
What do you want to know?
As with Cs 5.5, the mixer only works on a track level, not on a clip level.
So if you do real time mixes with the mixer, then move anything in the timeline, the adjustments stay with the timing of the track, not with the individual clips.
It does have an awesome track based bussing/submix system (something I have missed since my Media100 days), and the multichannel export is improved.
There is also a new "adaptive" track which means that you can have stereo, mono, and surround clips on one track if that's helpful to you. if you want to keep things like FCP, I'd suggest working in mono tracks, with perhaps some stereo tracks for music.
Here's a good solid rundown:
http://www.retooled.net/?p=314
http://www.retooled.net/?p=317
Jeremy