Source: The Wrestling Observer Newsletter
There is currently major heat backstage on Mark Henry in WWE. WWE creative reportedly had a major storyline planned for him, but in the past week Henry contacted WWE and asked for time off to heal from injuries.
While WWE tells their performers they want them to rest when they are hurt, the feeling right now is that WWE is upset with Henry. They did a lot to build Henry up and get him hot again, only for him to ask for time off right after.