Well, I've finished playing the alpha and I must say that wizards, as I'm sure many people have said already, are too OP at the moment.
-Due to their Intelligence boost they get more ability points. And they don't have to dump any points into other stats like speed, perception or consitiution to be any good.
-Warriors and even rangers skills are too underwhelming compared to the range, AOE and power of the wizard's spells.

Suggestions:
There's gotta be some incentive to play those other two classes.
Maybe every primary stat - Strength, Dexterity and Intelligence should only give extra ability points in their corresponding ability tree? Like, increase Strength and you get more Warrior abilitity points?
The other suggestion would be to get rid of the ability boosting altogether, but then the given points number must be very well balanced.
The Warrior class to be effective must have more action points and better initiative in battle to be effective - otherwise in most battles he doesn't seem to be able to run to the enemies fast enough, because ranger or wizard already used their skills and killed everyone.