IIRC, snow layering like this has been in the code since alpha, but Notch chose not to implement it because it took away from the game's blocky aesthetic. It's strange that Jeb has decided to implement it now, but he probably did it because it was a simple addition that only took him a few minutes.With the most recent snapshot (13w05a), any idea what the point of having 8 different heights of snow per block is? Of all the things that people have asked for as a feature, I can't say I've ever heard of this one.