What I know about advancement in Project Eternity is that, each of the 11 classes will get a class specific ability at each level up and you can choose talents (feats in NWN2) every third level. We only know that there will be attributes but not what they will impact. the developers have said that they wanted to avoid trap skills/talents. I think it will be closer to NWN2 in terms of building your character but I also think it will be more forgiving for "wrong" character development.