HDMI-Out - Hands On
So, I just plugged the Xoom into the little micro-HDMI cable (picked one up from New Egg for my Evo) and heres what I found:
Mirror mode seems to absolutely work. It didnt at first, but unplugging it and plugging it back in while the Xoom was on did the trick.
Everything that I did on the Xoom, showed up on my TV and played through the TV's speakers. Switched between homescreens, messed with email, played angry birds, pulled up Google maps, browsed the youtube app/videos, played music (that came pre-loaded) and browsed the pictures in my gallery. I certainly saw enough to believe that "Mirror Mode" means exactly that... and it works out of the box. Audio and all.
Now, there might be a couple of hiccups if trying to play drm-ed content, but I didnt have any to try.