In Cataclysm, Elemental Shamans and Balance Druids will share gear with Restoration Shamans and Druids and thus have Spirit on their gear. Blizzard's solution is to give these specs a talent that will convert Spirit into Hit Rating. Does anyone else think this is a pretty terrible idea?
Hit is already a confusing stat. Go read the official forums: every day there are a ton of new posts asking what the Hit cap is for a certain class/spec. Now imagine having to also figure out what percentage of your Spirit is giving you Hit and how much Hit you need from other items. The large portion of the WoW community that doesn't read the forums or Elitist Jerks is going to be totally lost.
Hit is a stat you want to cap, but not go over. Essentially having hit rating on all of your gear is going to be problematic and difficult to balance. If Blizzard makes it so Spirit gives too much Hit, you have wasted stat points. If it gives too little Hit, they'll just wear cloth and get their hit more efficiently elsewhere. Also, managing a few items with large amounts of hit rating like we do now is much simpler than having to manage every piece of gear you have in order to stay at the cap.
I'm also concerned about the item budget. Unless Spirit costs almost nothing, Elemental Shamans and Balance Druids will have far less Haste/Crit on their gear than any other caster class.
Obviously we're going to have to wait and see on this, but all signs point to bad.