It is far more evident that a Divinity 3 will be released provided sales do well and I don't see why they wouldn't do well.
Actually, it's already well-know that sequel will be in 2010, right after a year since Episode 1 release. What do we have here? Lessee... 3 unique locations for 5 years and some new (approx. 3 too) just for one year...
That the logical statement from your POV. Seriously, do you really believe in that? I'm not. Pretty sure we just got like a 40%-50% of the developed game content in Episode 1.