The client is currently Patch 1.12 across all servers. Class mechanics, talents, and items are in line with the last Vanilla patch, but major pieces of patch content, such as the addition of Naxxramas, Zul'gurub, Ahn'qiraj, and any associated quests etc. are still timegated and not implemented into some servers yet. Snarler's innate resistances were removed in 1.3, and therefore don't exist on these servers.