Mark Henry is very unhappy in WWE right now and was vehemently opposed to dropping the World Heavyweight Championship because of injury. I'm told while Henry has been assured he's slated for a big babyface push soon, he's "completely against it" and has talked of retiring when his contract expires.
As one source put it bluntly, "WWE has a pretty grumpy World's Strongest Man on their hands."
Henry feels his hard work helped re-establish Smackdown in the ratings and the show should have continued to be built around his heel push under the "hall of pain" gimmick.
One source with knowledge of Henry's mindset tells me under the condition of anonymity that he feels like WWE cut the legs out from under him way too soon. He hasn't remained silent either, making his discontent very well known.
Remember Henry said prior to his main event push in March 2011 he was in the final 18 months of his career.