Ok, here are a few points addressed in the PC Action preview of Drakensang. I don't know what is already known, so I just post everything I think is interesting.

Warning: Potential spoilers!

• You don't have to know the first three DSA games to enjoy Drakensang
• The preview version they played at the developers Berlin studio was 80% complete.
• In the beginning your character travels to the capital Ferdok to meet with an old friend called Ardo. But he is missing and after a few inquiries you find out that there have been several murders in Ferdok and that your friend is somehow involved.
• Later on the player will learn that Ardo is dead and stumble across a big conspiracy.
• You may play elves, dwarfes and humans
• You do not need to understand the pnp system to play the game.
• There won't be day/night cycles
• You walk from one area into another by using a map (like BG oder NWN2 I think)
• There will be 50 locations, all about 1km^2
• There are random encounters
• The game looks and feels like a BG
• Six person party: Four heroes, one guest and a summoned creature
• You may 'store' your characters in one location and they level even if you are not using them (see NWN2 or Kotor)
• you may pause combat at any time
• There are 40 spells
• Some of them have been modified (for example the 'five-minutes' spells)
• You can hurt your own party members if you are not careful enough
• Not all dialogues will be synchronized
• There will be only on ending but a few ways to get there