Abomasnow usage is down because of wobb. It utterly destroyed the hail team. I haven't used mine once since it became legal. Since it is now banned (thank God for Smogon), i'd expect Abomasnow back in OU next month.
Spiritomb was expected since it's a great Deoxys-E counter, but why Roserade? I honestly don't see too many, so what am I missing? Not that i'm complaining, I love roserade, but I haven't seen anything to warrant OU status yet.