My poor Shaman. I wish they could keep Cleansing Totem as a "one pulse" ability that removes a disease and poison of everyone within range when you drop it and that's it. I'm taking these changes to mean overall that in PvE at least, particularly in 5 man groups, most of the powerful enemy debuffs will be magic.
It seems to me that it would be more appropriate for Paladins to have Magic, Disease and Curse while Shamans had Magic, Offensive Magic and Poison.