EDIT 7/1/14Looks like Gamepedia has won. Users have been adding some useful information there while nothing has been updated on Wikia. I don't think it's too soon to crown Gamepedia the wiki victor.
Here's the link:
http://divinity.gamepedia.com/Divinity_Wiki-----------------------------------
Since the game is new, is there an official wiki that Larian has used for previous games?
The two used previously are:
http://divinity.wikia.com/wiki/Divinity_Wikiand
http://divinity.gamepedia.com/Divinity_WikiGamepedia is a Curse operated site and is the home to a number of games such as DOTA2.
On the other hand, the Wikia site seems to be in a bit of a better state. There's also a reddit thread popup asking for users to help add information to the Wikia page found here (
http://www.reddit.com/r/DivinityOriginalSin/comments/29hru6/the_divinity_wiki_needs_information/)
I think it would be wise to pick one so as to not fragment information as we populate it with our findings. Any reason not to go with the Wikia site? I was hoping to begin adding information there this evening.