>>36966399Okay, I checked and it's looked like the distribution of new sprites was mainly determined by size. Every fully evolved Pokémon that got a large sprite had a height above 4 feet, then there is a grey area at 3'11 where a species at that height either receives a large sprite (Vileplume) or they don't (Fearow).
Also, Arbok got a new sprite. It's subtle, but it is different from the one it had before.