I think this works better than 5x shaman as it gives better tanking for harder boss and mobs, especially once DM is released.

I personally plan on 1x druid and 4x shamans (all Tauren) as , so I can use the druid as a feral tank or boomkin (3 crit) / emergency tank.

Plus with talents, cat form gets 30% speed to keep up with ghost wolf until they get travel.