I just played the PC demo.
All I can say is, if Bioware succeeds in getting 1 million people to download and play the demo, they will be well on their way to selling 1 million copies. (I just checked and they have already reached around 330,000 downloads.)
The demo seemed to be partially the same as the version I played for a few minutes at Comic-Con last summer, where I got to fight the Ogre and some darkspawn.
However, at 1920x1080 resolution, in DirectX 11 mode, with much higher res textures compared with the Comic Con demo and SSAO, it was gorgeous projected on the living room wall from my 1080p projector. Can't wait until the full Steam version is unlocked. The PC demo seems to have a number of higher video settings that are locked, but should be available in the full game.
I played a Fem Hawke mage, unchecked all the tactics for all the followers and used pause to micro manage every action by each character.
Most important, across the board excellent voice cast and writing. This is where Bioware shines, so I was expecting this to be the case. The art direction and character design were tremendously well done.
I was very impressed with how the dev team managed to design the game in such a way that the fps stayed quite high, despite playing on my laptop in 1080p with Radeon 5830M video card, with textures that were clearly higher resolution than DAO textures. The only point where the frame rate seemed to drop a bit was the cutscene after Flemeth's appearance when there were lots of flames on the ground. Which still looked gorgeous, despite the lower frame rate.