It is going to be possible in Beyond Divinity, and the cost will be money, depending on how high your level is. I think Raze knows the exact figures, but it's about 300 at level 2, 500 at level 3 etc... I think it goes up exponentially somehow, so that once you're at level 50, one skillpoint will cost you a few hundred thousand gold. But I could be wrong ofcourse.
Tovi 
