According to the Divinity: Original Sin preview at Buffed.de, the folks at Larian Studios plan on launching a Kickstarter campaign to "partially" fund the game several months before the promised release in September/October. (Pages 1 and 3 of the preview reference Kickstarter - I won't quote them here since they're in German, but you can easily find them.)

Thus far it seems to be the only source mentioning Larian's Kickstarter plans. I just hope the fabled Kickstarter fatigue doesn't prevent them from reaching their funding goal, whatever it might be.