Alright, I never played DA:O, but I think I may have to now.
The demo is a really great one. It actually has a story, as you play three separate "scenes" that all weave together.
The combat was really responsive and fun. I played as a mage and there were some really cool beginning spells.
You get to do a bunch of conversations and take them whichever way you choose. I chose the "light" way, or whatever it's called, as I felt I could get the most information that way.
No character customization or loadouts, but I leveled up a few times and you can create tactics, of which there seem to be a million options.