(EDIT: Apparently my demo review caused some offence so now owning the game I feel shamed into updating my previous contribution. Huh, it's still plays and feels the same as what I played in the demo and I reckon my original review is still valid. I just want to add that the story is pretty cool but no spoilers here.)
Whilst the demo is only a small part of the game it is representative of the finished product; or it wouldn't be a good demo.
The demo shows a complete change from origins (not sure if Woolsey was playing the same demo I was), with a complete overhaul of the combat system, graphics and dialogue system.
The mage is more is more or less unchanged but the two other classes are much more playable - it now focusses a bit more on the hack and slash style, rather than the slow more tactical origins style.
Dialogue system is that of Mass effect, which could perhaps limit conversation variation but I personally love it.
My main concern (emphasis on my) is that whilst the graphics are improved, the character models have changed and not to my liking.
So yeah I was happy with the demo and my advice is to go and download the demo because a LOT has changed and though I like the changes, they aren't going to be everyone's cup of tea.
N.B. The developers have made the normal difficulty in this game, the same as casual was on origins and advise more experienced players to start playing on hard difficulty.