Meltzer said that Sting's return has been a plan for a while, and isn't due to the ratings dropping. In addition to this, it was noted that it won't be a surprise appearance at the event, and that it'll be built up over several weeks. Apparently WWE had a plan set for Sting's return, but those plans changed due to an undisclosed injury to one of the parties involved, and a new plan was made.
Sting was last seen at WrestleMania, when he made his WWE in-ring debut in a losing effort against Triple H. It is now expected that he'll also be participating in next year's WrestleMania.