Sting has indeed signed a deal with WWE. There’s no word yet on details regarding what role he will play but he is scheduled to be on TV, but not right away.
It’s said that the deal has been close to being done for a while but now it has been signed. Sting’s assumption was that he would work with The Undertaker, which many expected, but that’s up in the air with Taker’s future now in question.
The deal includes Sting being on television, but whether that’s as a regular character or just to build for one match at next year’s WrestleMania, that isn’t clear. He obviously won’t be a full-time wrestler.
(Source: Wrestling Observer Newsletter)