To those not familiar with the retro-clone, all saves are based on abilities, that are either Primed (things that you are good at) or not. This changes the DC of a given roll. If something is a class feature (say, sneaking for a thief), you get a bonus to it equal to your level.
To me if fells a little like the dragon age RPG.
This is a good thing; Castles and Crusades was a really cool system and it would be nice if it influenced the next edition of Dungeons and Dragons.