New Observer Station Look You can now remove the menu bar on the top left, and the bottom UI! There are now overlays in-game (Tug of war style): Player Names (including race and supply count) APM Kills (workers & Units) Army (Supply of Army Units and Worker Units) Economy (mineral and gas count)
Well it looks like the extra overlay bits are for flashing up extra info sometimes, when that's the 'focus' of the commentary for that second, so being intrusive isn't a massive issue. Also it's good for lower quality streaming to make it easy to see.
That's awesome. We can only hope that the same XML customability that Blizzard designed into WoW will ultimately make it's way into SC2. The possibilities are staggerring.