The daily hyjal quest "The protectors of Hyjal" involves numerous npc's, some of whom
give you various buffs. It seems to vary on a daily basis what buffs you get as to some
extent it is dependent on the random "celebrity" NPC you are assigned.
One of the common buffs is "mark of the wild". I went into a bg after receiving this and
noticed that it was not overwritten by a pally's "blessing of kings" as it is usually.
I think what is happening is the Hyjal buff is a slightly different version of the normal
motw spell and is stacking with other buffs. A 4% extra stats buff is pretty useful.
Disclaimer: I don't play hunter or pallies so I may have just screwed up here somewhere.
Would appreciate clarification.