WWE posted video footage of Sting's surprise appearance at the San Diego Comic Con on Thursday at this link. You can also watch embedded in the video below:
Michael Cole introduced Sting as one of the most iconic names in WCW history, making his first WWE appearance of any kind. Sting said that it was awesome to be there and his first WWE action figure was very special to him. Cole asked him if he ever thought this would happen and Sting said he thought it would happen but so much time had passed, he was starting to wonder.
As for what this means for Sting/WWE, nothing has changed. The two parties have already come to terms on a licensing and merchandise deal that will see WWE release a DVD/Blu-Ray set on him in September. They're already selling Sting t-shirts on dot com and obviously, Mattel is on board with an action figure. He's also pre-order DLC for the WWE 2K15 video game.
A separate deal will have to be worked out if Sting were to wrestle and obviously, he hasn't been shy that he wants a match against The Undertaker. That not only hinges on WWE's desire for Sting to compete at age 55 (he'll be 56 at Wrestlemania 31) but Undertaker's desire and health for such a match.
We posted photos from Sting's surprise appearance and WWE posted a backstage video that you can watch below: