Courtesy of LordsofPain.net:
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.
Read more at http://www.lordsofpain.net/news/wwe