Again, wont be able to download it until tonight however, from what I hear it wont be a straight forward 1 level demo. You will get to play little snippets of different levels to give you a total feel to the game.
As for Devil May Cry 3, to be fair it was me that said in another thread that it was mega hard - and it is however, if the game saw that it was smashing you all over the place again and again to be fair to it you would eventually get a message asking you if you wanted to switch to an easier level (an option which wasn't earlier available) to be honest this message made me more angry as it felt to me like the dam thing was mocking me so I ignored to help and carried on getting battered.
As for the new game, there is something that I have read that disturbs me. What I heard was that you play through quite a bit of the game and then you have to do the EXACT bits all over again with a different character.
PLEASE take my DMC comments as a pinch of salt though because as I keep saying, I haven't actually played either the demo or main game yet and these are only rumblings that I hear