Multiplayer.it describes the demo played in more detail.
Apparently it begins in some woods where the presenters fought some spiders, then they went in a dungeon populated by skeleton and in the end fought a sort of samurai-skeleton with a blue aura called Drakomir (wtf?).
For now they say that we don't know much about the content, but the lighting and engine were particularly impressive.
Their fear is that the game will be much less interesting if played in single player (and from the look of it, I agree, that's one of my fears too).
They also mentions that every class has its peculiar animations, and the ones they saw were all well done (no more Alpha Protocol crouch walking? looks like it).
Oh, they also mention that apparently the Archon doesn't only have fire spells (blue fire, apparently) but also healing spells, that were used during the boss fight while the Guardian was busy beating the crap out of Drakomir.