Hey Kap'n,
I've got this set. It lists it as "5.1 and pcm stereo" (except the documentaries, pcm stereo only). Funny though, I got it before I had a 5.1 setup so I've never heard the 5.1 mix, but it was really good even in stereo.
Thx for the reminder - now that I've got the box off the shelf I'll have to spin the 5.1 mix first chance I get.