If you head over to GOG you can
pay what you want for Divine Divinity, assuming you're inclined to give it a chance. That could give you an idea of D:OS should be like. DD has much more world interaction than DKS (you can move chests or furniture, etc, around, stash stuff wherever you wish, etc). You can pull levers and light a couple candles in DKS, but there was more of a sense of exploration in DD, where a pile of boxes or rocks could be covering something, and lighting candles around a pentagram was more of a random encounter than the obvious quest related instance in DKS. Of course in DKS the quest design is much more elaborate, and the world not nearly as flat, etc. The music, dialog, atmosphere, etc are similar.
From what I understand, the possibility of co-op play in D:OS should not hurt the single player focus.
FWIW someone from Larian mentioned that with the mod tools being released it is possible someone could mod the game to allow rotation of the camera, though the artwork was designed assuming a fixed angle camera, so that would expose some missing walls, and stuff like that.
