Original Sin - Preview @ Gamercast

Gamercast has a preview for this game.
http://www.gamercast.net/e3-2012-original-sin-preview

A quote about the combat system:

Contrary to their previous games, Original Sin features turn-based combat and is fuelled by action points that determine a players ability to move, attack, and even equip items and use skills. To add a bit of variation, in combat your most useful weapon is not some fancy sword or magic, but your environment; barrels of oil can be split open and set alight, water can be turned to ice, you can even make it rain to your advantage, however your enemy will also use the environment against you, so if you do not act fast you may well find yourself in a sticky situation.

A quote on how Larian sees the digital version:

What is very exciting, and different about Divinity: Original Sin is that the developers see it as the digital version of a pen and paper roleplaying game, which in essence is a very cool idea, and they see it as a potential couch co-op where players work together for a variety of systems, more importantly the unique conversation system that hopes to emulate the group conversations that would take place in a roleplaying game. When one player starts up a conversation everyone can get involved, make their own choices and start long dialogues with each other in real life pertaining the the questionable choices they have made in game, suddenly Original Sin is not just a game where three clients play with the host, but where four players play as a real group.