Although it's the stereo layer and not the surround....this sends cold shivers down my spine
I'd say past releases have show that the surround mix is generally more dynamic than the stereo, but off the top of my head I can think of many releases that sound amazing despite loud mastering (Tusk, Fleetwood Mac, PT's In Absentia and Deadwing, either Chicago DVD-A, etc). If it's loud, so be it.
I'm much more interested in the surround mix itself (placement of instruments, panning, etc), and based on what I've read so far I'm pretty confident it's gonna be good.