6. Along with weapons, shields and magic, there is also a claw type device you find and permanently wear. It can cast 3 different types of "spells". Projectile, explosive and one more that escapes me. This takes up magic power(which slowly regens on its own btw) but seems to be independant of actual magic. Apparently it can be upgraded to become more powerful, but there is no crafting in the demo so it remained fairly week and I hardly used it. My guess is that this thing will have some strategic gameplay elements as the game progresses.
7. You don't have mainhand/offhand items in the same way as DkS. Basically you equip a shield, a weapon, the claw and magic. You cycle between these 4 states by tapping on the directional pad(I'm playing with a 360 pad). You can dual wield certain weapons, but you only need one weapon to do it. If you find a new dagger, selecting the dual wield state simply gives you 2 of them. It doesn't seem like you can dual wield different weapons as of yet(though this is a demo so who knows what will change). There are bucklers and larger shields, but only buckler class can parry and it seems the bigger shields can bash.
8. There are bloodstains, aka your "ghost", which is left behind when you die. They work like DkS except for 2 things. 1. They slowly lose experience over time, giving you a time limit to retrieve them. 2. When you are near it, it gives you a passive buff. Meaning if you die in a boss battle you can take advantage of this ghost by not picking it up and getting some sort of benefit. I didn't quite catch what the buff was, I'll have to investigate further.
9. There are no souls of course, only experience. This experience is used at checkpoint locations, some sort of floating shard, that is basically a bonfire. You must choose between using the experience for raising stat points or magic power. You can allocate exp to either of these which are represented by a bar. When it fills up, you get a point. You can't cast any spells until you have at least one spell point, and each spell seems to have at least 3 different levels of power meaning you can make them stronger than the default spell. Also you get an experience bonus for every enemy you kill up until you use a checkpoint. Meaning, if you bypass leveling up at checkpoints you can get more experience than if you just level everytime. Risk vs reward.
10. So far I've seen hammers, greathammers, axes, greataxes, swords, greatswords, monk staffs, fist weapons, daggers and shortsword. They all have minimum requirements and there seems to be some sort of scaling stat. There is also a critical stat for ripostes and backstabs. As of now, the highest critical stat I've seen is 350% on one of the fist weapons called a nail while the standard dagger was 300%. There is no crafting yet, but I keep finding a bunch of "shards" that are supposedly going to be used for crafting, though I have no clue of how it's going to work. Also I have not ran into any bows or crossbows yet....
11. There is some sort of portal system in the game that opens up optional areas. I ran by it and it was just a circle on the ground but after defeating the first mini-boss I went back and it became an actual portal. Apparently they can be any of 3 things, including treasure or a difficult encounter. Mine was just a portal to a dark dimensional pocket with 3 chests. I'm not sure if that was just luck, or the demo only contains this option. Apparently these will be scattered across the game for those willing to take a risk and they can only be accessed after killing the area boss.
Dark Souls Youtube channel - Tutorials, challenge runs, pvp and new content.
http://www.youtube.com/user/vageta311