I guess the only way to find out is to plug a USB-DAC onto the Galaxy Nexus (w/ 4.1) and see what happens
Too bad I have a Galaxy S2 and Samsung probably will not be porting 4.1 over to it any time soon. Can only hope the XDA community can release something useable soon.
Atleast you get 4.0, Motorola users on the Droid x2/droid 3, both Tegra 2 phones only about a year old, aren't getting ICS at all, outside of custom roms
I'm glad to hear it in general they've listened though!