A Steam Community announcement outlines details of a patch that's now live for Divinity: Original Sin with the first official update for Larian Studios' new RPG. The Larian Studios forums have the enormous list of changes in the patch, which brings the game to version 1.0.72 for those keeping score at home. Here's the summary, outlining the new AI personalities feature this introduces:

We just released the first official patch for Divinity:Original Sin which introduces the concept of AI personalities.

During character creation, you can now select a specific personality for your characters. When a personality is active the AI will automatically make dialogue choices (based on its personality) for the avatar that isn't selected.

In addition to this, we've made a lot of improvements as well as bug fixes and balancing changes. You do not need to start a completely new game for these changes to work. Of course, your savegames will keep on working.

You'll also notice that you can now publish to Steam Workshop using the Divinity Engine Toolkit.