Since there's no NDA on beta 1... The new audio stack drops all hardware acceleration and is as of broken in multiprocessor mode. Internally, it seems to have been restructured, using things called audio transform modules (or something), that'll take care
of getting the data prepared for optimal output. Other than that, details are sketchy.
How's DRM woven into this? Are the days of re-recording a DRM-protected WMA files gone for good?