Will xp be distributed evenly among party members like in bg 1 and 2, that is a party of 3 will level up twice as fast as a party of 6 members?
How do you gain XP outside of combat?
Can you play a non-combat oriented party and do well in the game?
If you haven't had the chance to check out the (I think two now?) gameplay reveal videos, you should. If I recall correctly, plenty of opportunities for earning XP outside combat (thru exploration, conversation, etc) and lots of opp for stealthy characters to sneak around and find ways to defeat enemies (e.g., traps, environmental lighting and using objects) that don't involve head on combat.
