Seems like AMA thread slightly died so you can read many interesting things here:
http://www.reddit.com/r/IAmA/comments/1cxzw4/we_are_larian_studios_developing_divinity/?limit=500We have two important parameters going in the background in this regard: affinity and affection.
Affinity determines how well you work together as a team, as professionals: you're both noble most of the time for instance; or you both enjoy extortion. There are tons of different options here.
Affection determines how well you relate to one another on a personal level. Often times cooperative dialogs will be discussions about the morality of decisions and situations. Do you relate? Do feel the same about important questions in life?
These two combined will in turn determine what way the two protagonists are going to evolve in relationship-wise. Will they end up hating one another (yet respecting each other professionally for instance); will they end up as friends; as lovers; as soul mates - or anything in between?
The outcomes will be varied and many!
contain more something like hints or wishes instead of hand-holding, telling you what to do where, commands. Open, free world, free to explore. Secrets.
There is no respawn. Monsters also don't level to your level.
Yes there will be difficulty settings. We are still talking about the details.
It will be an option to customize the char after you join if the host allows it.
The optimization phase has not started yet, but atm, the lowest system specs it runs on is a five or six year old computer (mine, at home) with an Intel Core2Duo, 4GB ram, ATi HD4850.